Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

Descriptions and uses for these constants are described within the curl_setopt(), curl_multi_setopt() and curl_getinfo() documentation.

CURLFTP_CREATE_DIR (int): Available as of PHP 7.0.7 and cURL 7.19.3
CURLFTP_CREATE_DIR_NONE (int): Available as of PHP 7.0.7 and cURL 7.19.3
CURLFTP_CREATE_DIR_RETRY (int): Available as of PHP 7.0.7 and cURL 7.19.3
CURLFTPSSL_TRY (int)
CURLFTPSSL_ALL (int)
CURLFTPSSL_CONTROL (int)
CURLFTPSSL_NONE (int)
CURLFTPMETHOD_DEFAULT (int): Available as of PHP 8.2.0 and cURL 7.15.3.
CURLALTSVC_H1 (int): Available as of PHP 8.2.0 and cURL 7.64.1.
CURLALTSVC_H2 (int): Available as of PHP 8.2.0 and cURL 7.64.1.
CURLALTSVC_H3 (int): Available as of PHP 8.2.0 and cURL 7.64.1.
CURLALTSVC_READONLYFILE (int): Available as of PHP 8.2.0 and cURL 7.64.1.
CURL_SSLVERSION_DEFAULT (int)
CURL_SSLVERSION_TLSv1 (int)
CURL_SSLVERSION_SSLv2 (int)
CURL_SSLVERSION_SSLv3 (int)
CURL_SSLVERSION_TLSv1_0 (int)
CURL_SSLVERSION_TLSv1_1 (int)
CURL_SSLVERSION_TLSv1_2 (int)
CURL_SSLVERSION_TLSv1_3 (int): Available as of PHP 7.3.0 and cURL 7.52.0
CURLHSTS_ENABLE (int): Available as of PHP 8.2.0 and cURL 7.74.0
CURLHSTS_READONLYFILE (int): Available as of PHP 8.2.0 and cURL 7.74.0
CURLAUTH_BASIC (int)
CURLAUTH_DIGEST (int)
CURLAUTH_GSSNEGOTIATE (int)
CURLAUTH_NEGOTIATE (int): Available as of PHP 7.0.7 and cURL 7.38.0.
CURLAUTH_NTLM (int)
CURLAUTH_NTLM_WB (int): Available as of PHP 7.0.7 and cURL 7.22.0
CURLAUTH_ANY (int)
CURLAUTH_ANYSAFE (int)
CURLAUTH_AWS_SIGV4 (int): Available as of PHP 8.2.0 and cURL 7.75.0.
CURLPX_BAD_ADDRESS_TYPE (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_BAD_VERSION (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_CLOSED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_GSSAPI (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_GSSAPI_PERMSG (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_GSSAPI_PROTECTION (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_IDENTD_DIFFER (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_IDENTD (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_LONG_HOSTNAME (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_LONG_PASSWD (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_LONG_USER (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_NO_AUTH (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_OK (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_RECV_ADDRESS (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_RECV_AUTH (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_RECV_CONNECT (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_RECV_REQACK (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_ADDRESS_TYPE_NOT_SUPPORTED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_COMMAND_NOT_SUPPORTED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_CONNECTION_REFUSED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_GENERAL_SERVER_FAILURE (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_HOST_UNREACHABLE (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_NETWORK_UNREACHABLE (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_NOT_ALLOWED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_TTL_EXPIRED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REPLY_UNASSIGNED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_REQUEST_FAILED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_RESOLVE_HOST (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_SEND_AUTH (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_SEND_CONNECT (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_SEND_REQUEST (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_UNKNOWN_FAIL (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_UNKNOWN_MODE (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURLPX_USER_REJECTED (int): Available as of PHP 8.2.0 and cURL 7.73.0
CURL_PUSH_OK (int): Available as of PHP 7.1.0 and cURL 7.44.0
CURL_PUSH_DENY (int): Available as of PHP 7.1.0 and cURL 7.44.0
CURL_REDIR_POST_301 (int): Available as of PHP 7.0.7 and cURL 7.18.2
CURL_REDIR_POST_302 (int): Available as of PHP 7.0.7 and cURL 7.18.2
CURL_REDIR_POST_303 (int): Available as of PHP 7.0.7 and cURL 7.25.1
CURL_REDIR_POST_ALL (int): Available as of PHP 7.0.7 and cURL 7.18.2
CURL_TIMECOND_NONE (int)
CURL_TIMECOND_IFMODSINCE (int)
CURL_TIMECOND_IFUNMODSINCE (int)
CURL_TIMECOND_LASTMOD (int)
CURL_VERSION_ALTSVC (int): Available as of PHP 7.3.6 and cURL 7.64.1
CURL_VERSION_ASYNCHDNS (int): Asynchronous DNS resolves. Available as of PHP 7.3.0 and cURL 7.10.7
CURL_VERSION_BROTLI (int): Available as of PHP 7.3.0 and cURL 7.57.0
CURL_VERSION_CONV (int): Character conversions supported. Available as of PHP 7.3.0 and cURL 7.15.4
CURL_VERSION_CURLDEBUG (int): Debug memory tracking supported. Available as of PHP 7.3.6 and cURL 7.19.6
CURL_VERSION_DEBUG (int): Built with debug capabilities. Available as of PHP 7.3.0 and cURL 7.10.6
CURL_VERSION_GSASL (int): Available as of PHP 8.2.0 and cURL 7.76.0
CURL_VERSION_GSSAPI (int): Built against a GSS-API library. Available as of PHP 7.3.0 and cURL 7.38.0
CURL_VERSION_GSSNEGOTIATE (int): Negotiate auth is supported. Available as of PHP 7.3.0 and cURL 7.10.6 (deprecated as of 7.38.0)
CURL_VERSION_HSTS (int): Available as of PHP 8.2.0 and cURL 7.74.0
CURL_VERSION_IDN (int): Internationized Domain Names are supported. Available as of PHP 7.3.0 and cURL 7.12.0
CURL_VERSION_MULTI_SSL (int): Available as of PHP 7.3.0 and cURL 7.56.0
CURL_VERSION_NTLM (int): NTLM auth is supported. Available as of PHP 7.3.0 and cURL 7.10.6
CURL_VERSION_NTLM_WB (int): NTLM delegation to winbind helper is supported. Available as of PHP 7.3.0 and cURL 7.22.0
CURL_VERSION_IPV6 (int): IPv6-enabled.
CURL_VERSION_KERBEROS4 (int): Kerberos V4 auth is supported.
CURL_VERSION_KERBEROS5 (int): Kerberos V5 auth is supported. Available as of PHP 7.0.7 and cURL 7.40.0
CURL_VERSION_HTTP2 (int): HTTP2 support built-in. Available as of cURL 7.33.0
CURL_VERSION_HTTP3 (int): Available as of PHP 8.2.0 and cURL 7.66.0
CURL_VERSION_LARGEFILE (int): Supports files larger than 2GB. Available as of cURL 7.33.0
CURL_VERSION_PSL (int): Mozilla's Public Suffix List, used for cookie domain verification. Available as of PHP 7.3.6 and cURL 7.47.0
CURL_VERSION_SPNEGO (int): SPNEGO auth is supported. Available as of PHP 7.3.0 and cURL 7.10.8
CURL_VERSION_SSPI (int): Built against Windows SSPI. Available as of PHP 7.3.0 and cURL 7.13.2
CURL_VERSION_SSL (int): SSL options are present.
CURL_VERSION_TLSAUTH_SRP (int): TLS-SRP auth is supported. Available as of PHP 7.3.0 and cURL 7.21.4
CURL_VERSION_UNICODE (int): Available as of PHP 8.2.0 and cURL 7.72.0
CURL_VERSION_UNIX_SOCKETS (int): Unix domain sockets support. Available as of PHP 7.0.7 and cURL 7.40.0
CURL_VERSION_ZSTD (int): Available as of PHP 8.2.0 and cURL 7.72.0
CURL_VERSION_LIBZ (int): libz features are present.
CURLVERSION_NOW (int)
CURLFTPAUTH_DEFAULT (int)
CURLFTPAUTH_SSL (int)
CURLFTPAUTH_TLS (int)
CURLPROXY_HTTP (int): Available as of cURL 7.10.
CURLPROXY_HTTP_1_0 (int): Available as of PHP 7.0.7 and cURL 7.19.3
CURLPROXY_SOCKS4 (int): Available as of cURL 7.10.
CURLPROXY_SOCKS5 (int): Available as of cURL 7.10.
CURL_NETRC_OPTIONAL (int)
CURL_NETRC_IGNORED (int)
CURL_NETRC_REQUIRED (int)
CURL_HTTP_VERSION_NONE (int)
CURL_HTTP_VERSION_1_0 (int)
CURL_HTTP_VERSION_1_1 (int)
CURL_HTTP_VERSION_2 (int): Available as of PHP 7.0.7 and cURL 7.43.0
CURL_HTTP_VERSION_2_0 (int): Available as of cURL 7.33.0
CURL_HTTP_VERSION_2TLS (int): Available as of PHP 7.0.7 and cURL 7.47.0
CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE (int): Available as of PHP 7.0.7 and cURL 7.49.0
CURLMSG_DONE (int)
CURLSSLOPT_ALLOW_BEAST (int): Available as of cURL 7.25.0
CURLSSLOPT_NO_REVOKE (int): Available as of PHP 7.0.7 and cURL 7.44.0
CURLSSLOPT_AUTO_CLIENT_CERT (int): Available as of PHP 8.2.0 and cURL 7.77.0
CURLSSLOPT_NATIVE_CA (int): Available as of PHP 8.2.0 and cURL 7.71.0
CURLSSLOPT_NO_PARTIALCHAIN (int): Available as of PHP 8.2.0 and cURL 7.68.0
CURLSSLOPT_REVOKE_BEST_EFFORT (int): Available as of PHP 8.2.0 and cURL 7.70.0
CURLSSH_AUTH_AGENT (int): Available as of PHP 7.0.7 and cURL 7.28.0
CURLSSH_AUTH_ANY (int)
CURLSSH_AUTH_DEFAULT (int)
CURLSSH_AUTH_HOST (int)
CURLSSH_AUTH_KEYBOARD (int)
CURLSSH_AUTH_NONE (int)
CURLSSH_AUTH_PASSWORD (int)
CURLSSH_AUTH_PUBLICKEY (int)
CURLPIPE_NOTHING (int): Available as of cURL 7.43.0.
CURLPIPE_HTTP1 (int): Available as of cURL 7.43.0.
CURLPIPE_MULTIPLEX (int): Available as of cURL 7.43.0.
CURLPROXY_SOCKS4A (int): Available as of cURL 7.18.0.
CURLPROXY_SOCKS5_HOSTNAME (int): Available as of cURL 7.18.0.
CURLHEADER_SEPARATE (int): Available as of PHP 7.0.7 and cURL 7.37.0.
CURLHEADER_UNIFIED (int): Available as of PHP 7.0.7 and cURL 7.37.0.
CURLAUTH_GSSAPI (int): Available as of PHP 7.3.0 and cURL 7.54.1
CURL_MAX_READ_SIZE (int): Available as of PHP 7.3.0 and cURL 7.53.0
CURLPROXY_HTTPS (int): Available as of PHP 7.3.0 and cURL 7.52.0
CURL_SSLVERSION_MAX_DEFAULT (int): Available as of PHP 7.3.0 and cURL 7.54.0
CURL_SSLVERSION_MAX_NONE (int): Available as of PHP 7.3.0 and cURL 7.54.0
CURL_SSLVERSION_MAX_TLSv1_0 (int): Available as of PHP 7.3.0 and cURL 7.54.0
CURL_SSLVERSION_MAX_TLSv1_1 (int): Available as of PHP 7.3.0 and cURL 7.54.0
CURL_SSLVERSION_MAX_TLSv1_2 (int): Available as of PHP 7.3.0 and cURL 7.54.0
CURL_SSLVERSION_MAX_TLSv1_3 (int): Available as of PHP 7.3.0 and cURL 7.54.0
CURL_VERSION_HTTPS_PROXY (int): Available as of PHP 7.3.0 and cURL 7.52.0
CURLAUTH_BEARER (int): Available as of PHP 7.3.0 and cURL 7.61.0.
CURLSSH_AUTH_GSSAPI (int): Available as of PHP 7.3.0 and cURL 7.58.0
CURLMIMEOPT_FORMESCAPE (int): Available as of PHP 8.3.0 and cURL 7.81.0
CURLWS_RAW_MODE (int): Available as of PHP 8.3.0 and cURL 7.86.0
CURLKHMATCH_OK (int): Available as of PHP 8.3.0 and cURL 7.19.6
CURLKHMATCH_MISMATCH (int): Available as of PHP 8.3.0 and cURL 7.19.6
CURLKHMATCH_MISSING (int): Available as of PHP 8.3.0 and cURL 7.19.6
CURLKHMATCH_LAST (int): Available as of PHP 8.3.0 and cURL 7.19.6

curl-setopt()

Constants	Description
`CURLOPT_ABSTRACT_UNIX_SOCKET` (int)	Enables the use of an abstract Unix domain socket instead of establishing a TCP connection to a host and sets the path to the given string. This option shares the same semantics as `CURLOPT_UNIX_SOCKET_PATH`. These two options share the same storage and therefore only one of them can be set per handle. Available as of PHP 7.3.0 and cURL 7.53.0
`CURLOPT_ALTSVC` (int)	Pass the filename for cURL to use as the Alt-Svc cache file to read existing cache contents from and possibly also write it back to a after a transfer, unless `CURLALTSVC_READONLYFILE` is set via `CURLOPT_ALTSVC_CTRL`. Available as of PHP 8.2.0 and cURL 7.64.1.
`CURLOPT_ALTSVC_CTRL` (int)	Populate the bitmask with the correct set of features to instruct cURL how to handle Alt-Svc for the transfers using this handle. cURL only accepts Alt-Svc headers over HTTPS. It will also only complete a request to an alternative origin if that origin is properly hosted over HTTPS. Setting any bit will enable the alt-svc engine. The options are: `CURLALTSVC_H1`, `CURLALTSVC_H2`, `CURLALTSVC_H3`, and `CURLALTSVC_READONLYFILE`. Available as of PHP 8.2.0 and cURL 7.64.1.
`CURLOPT_AUTOREFERER` (int)	`true` to automatically set the `Referer:` field in requests where it follows a `Location:` redirect.
`CURLOPT_AWS_SIGV4` (int)	Provides AWS V4 signature authentication on HTTP(S) header. This option overrides any other authentication types that have been set in `CURLOPT_HTTPAUTH`. This method cannot be combined with other authentication types. Available as of PHP 8.2.0 and cURL 7.75.0
`CURLOPT_BINARYTRANSFER` (int)
`CURLOPT_BUFFERSIZE` (int)	The size of the buffer to use for each read. There is no guarantee this request will be fulfilled, however. Available as of cURL 7.10.
`CURLOPT_CAINFO` (int)	The name of a file holding one or more certificates to verify the peer with. This only makes sense when used in combination with `CURLOPT_SSL_VERIFYPEER`. Might require an absolute path.
`CURLOPT_CAINFO_BLOB` (int)	The name of a PEM file holding one or more certificates to verify the peer with. This option overrides `CURLOPT_CAINFO`. Available as of PHP 8.2.0 and cURL 7.77.0
`CURLOPT_CAPATH` (int)	A directory that holds multiple CA certificates. Use this option alongside `CURLOPT_SSL_VERIFYPEER`.
`CURLOPT_CA_CACHE_TIMEOUT` (int)	Available as of PHP 8.3.0 and cURL 7.87.0
`CURLOPT_CERTINFO` (int)	`true` to output SSL certification information to `STDERR` on secure transfers. Added in cURL 7.19.1. Requires `CURLOPT_VERBOSE` to be on to have an effect.
`CURLOPT_CONNECTTIMEOUT` (int)	The number of seconds to wait while trying to connect. Use 0 to wait indefinitely.
`CURLOPT_CONNECTTIMEOUT_MS` (int)	The number of milliseconds to wait while trying to connect. Use 0 to wait indefinitely. If libcurl is built to use the standard system name resolver, that portion of the connect will still use full-second resolution for timeouts with a minimum timeout allowed of one second. Available as of cURL 7.16.2.
`CURLOPT_CONNECT_ONLY` (int)	`true` tells the library to perform all the required proxy authentication and connection setup, but no data transfer. This option is implemented for HTTP, SMTP and POP3. Available as of cURL 7.15.2.
`CURLOPT_CONNECT_TO` (int)	Connect to a specific host and port instead of the URL's host and port. Accepts an array of strings with the format `HOST:PORT:CONNECT-TO-HOST:CONNECT-TO-PORT`. Available as of PHP 7.0.7 and cURL 7.49.0
`CURLOPT_COOKIE` (int)	The contents of the `"Cookie: "` header to be used in the HTTP request. Note that multiple cookies are separated with a semicolon followed by a space (e.g., "`fruit=apple; colour=red`")
`CURLOPT_COOKIEFILE` (int)	The name of the file containing the cookie data. The cookie file can be in Netscape format, or just plain HTTP-style headers dumped into a file. If the name is an empty string, no cookies are loaded, but cookie handling is still enabled.
`CURLOPT_COOKIEJAR` (int)	The name of a file to save all internal cookies to when the handle's destructor is called. Warning As of PHP 8.0.0, curl_close() is a no-op and does not destroy the handle. If cookies need to be written prior to the handle being automatically destroyed, call unset() on the handle.
`CURLOPT_COOKIELIST` (int)	A cookie string (i.e. a single line in Netscape/Mozilla format, or a regular HTTP-style Set-Cookie header) adds that single cookie to the internal cookie store. `"ALL"` erases all cookies held in memory. `"SESS"` erases all session cookies held in memory. `"FLUSH"` writes all known cookies to the file specified by `CURLOPT_COOKIEJAR`. `"RELOAD"` loads all cookies from the files specified by `CURLOPT_COOKIEFILE`. Available as of cURL 7.14.1
`CURLOPT_COOKIESESSION` (int)	`true` to mark this as a new cookie "session". It will force libcurl to ignore all cookies it is about to load that are "session cookies" from the previous session. By default, libcurl always stores and loads all cookies, independent if they are session cookies or not. Session cookies are cookies without expiry date and they are meant to be alive and existing for this "session" only.
`CURLOPT_CRLF` (int)	`true` to convert Unix newlines to CRLF newlines on transfers.
`CURLOPT_CUSTOMREQUEST` (int)	A custom request method to use instead of `"GET"` or `"HEAD"` when doing a HTTP request. This is useful for doing `"DELETE"` or other, more obscure HTTP requests. Valid values are things like `"GET"`, `"POST"`, `"CONNECT"` and so on; i.e. Do not enter a whole HTTP request line here. For instance, entering `"GET /index.html HTTP/1.0\r\n\r\n"` would be incorrect. Note: Don't do this without making sure the server supports the custom request method first.
`CURLOPT_DEFAULT_PROTOCOL` (int)	The default protocol to use if the URL is missing a scheme name. Available as of PHP 7.0.7 and cURL 7.45.0
`CURLOPT_DISALLOW_USERNAME_IN_URL` (int)	`true` to not allow URLs that include a username. Usernames are allowed by default (0). Available as of PHP 7.3.0 and cURL 7.61.0
`CURLOPT_DNS_CACHE_TIMEOUT` (int)	The number of seconds to keep DNS entries in memory. This option is set to 120 (2 minutes) by default.
`CURLOPT_DNS_INTERFACE` (int)	Set the name of the network interface that the DNS resolver should bind to. This must be an interface name (not an address). Available as of PHP 7.0.7 and cURL 7.33.0
`CURLOPT_DNS_LOCAL_IP4` (int)	Set the local IPv4 address that the resolver should bind to. The argument should contain a single numerical IPv4 address as a string. Available as of PHP 7.0.7 and cURL 7.33.0
`CURLOPT_DNS_LOCAL_IP6` (int)	Set the local IPv6 address that the resolver should bind to. The argument should contain a single numerical IPv6 address as a string. Available as of PHP 7.0.7 and cURL 7.33.0
`CURLOPT_DNS_SHUFFLE_ADDRESSES` (int)	`true` to shuffle the order of all returned addresses so that they will be used in a random order, when a name is resolved and more than one IP address is returned. This may cause IPv4 to be used before IPv6 or vice versa. Available as of PHP 7.3.0 and cURL 7.60.0
`CURLOPT_DNS_USE_GLOBAL_CACHE` (int)	`true` to use a global DNS cache. This option is not thread-safe. It is conditionally enabled by default if PHP is built for non-threaded use (CLI, FCGI, Apache2-Prefork, etc.).
`CURLOPT_DOH_SSL_VERIFYHOST` (int)	Verify the DNS-over-HTTPS server's SSL certificate name fields against the host name. Available as of PHP 8.2.0 and cURL 7.76.0.
`CURLOPT_DOH_SSL_VERIFYPEER` (int)	Verify the authenticity of the DNS-over-HTTPS server's SSL certificate. Available as of PHP 8.2.0 and cURL 7.76.0.
`CURLOPT_DOH_SSL_VERIFYSTATUS` (int)	Tell cURL to verify the status of the DNS-over-HTTPS server certificate using the "Certificate Status Request" TLS extension (OCSP stapling). Available as of PHP 8.2.0 and cURL 7.76.0.
`CURLOPT_DOH_URL` (int)	Provides the DNS-over-HTTPS URL. Available as of PHP 8.1.0 and cURL 7.62.0.
`CURLOPT_EGDSOCKET` (int)	Like `CURLOPT_RANDOM_FILE`, except a filename to an Entropy Gathering Daemon socket.
`CURLOPT_ENCODING` (int)	The contents of the `"Accept-Encoding: "` header. This enables decoding of the response. Supported encodings are `"identity"`, `"deflate"`, and `"gzip"`. If an empty string, `""`, is set, a header containing all supported encoding types is sent. Available as of cURL 7.10.
`CURLOPT_EXPECT_100_TIMEOUT_MS` (int)	The timeout for `Expect: 100-continue` responses in milliseconds. Defaults to 1000 milliseconds. Available as of PHP 7.0.7 and cURL 7.36.0
`CURLOPT_FAILONERROR` (int)	`true` to fail verbosely if the HTTP code returned is greater than or equal to 400. The default behavior is to return the page normally, ignoring the code.
`CURLOPT_FILE` (int)	The file that the transfer should be written to. The default is `STDOUT` (the browser window).
`CURLOPT_FILETIME` (int)	`true` to attempt to retrieve the modification date of the remote document. This value can be retrieved using the `CURLINFO_FILETIME` option with curl_getinfo().
`CURLOPT_FOLLOWLOCATION` (int)	`true` to follow any `"Location: "` header that the server sends as part of the HTTP header. See also `CURLOPT_MAXREDIRS`. This constant is not available when open_basedir is enabled.
`CURLOPT_FORBID_REUSE` (int)	`true` to force the connection to explicitly close when it has finished processing, and not be pooled for reuse.
`CURLOPT_FRESH_CONNECT` (int)	`true` to force the use of a new connection instead of a cached one.
`CURLOPT_FTPAPPEND` (int)	`true` to append to the remote file instead of overwriting it.
`CURLOPT_FTPASCII` (int)	An alias of `CURLOPT_TRANSFERTEXT`. Use that instead.
`CURLOPT_FTPLISTONLY` (int)	`true` to only list the names of an FTP directory.
`CURLOPT_FTPPORT` (int)	The value which will be used to get the IP address to use for the FTP "PORT" instruction. The "PORT" instruction tells the remote server to connect to our specified IP address. The string may be a plain IP address, a hostname, a network interface name (under Unix), or just a plain '-' to use the systems default IP address.
`CURLOPT_FTPSSLAUTH` (int)	The FTP authentication method (when is activated): `CURLFTPAUTH_SSL` (try SSL first), `CURLFTPAUTH_TLS` (try TLS first), or `CURLFTPAUTH_DEFAULT` (let cURL decide). Available as of cURL 7.12.2.
`CURLOPT_FTP_CREATE_MISSING_DIRS` (int)	`true` to create missing directories when an FTP operation encounters a path that currently doesn't exist.
`CURLOPT_FTP_FILEMETHOD` (int)	Tell curl which method to use to reach a file on a FTP(S) server. Possible values are `CURLFTPMETHOD_DEFAULT`, `CURLFTPMETHOD_MULTICWD`, `CURLFTPMETHOD_NOCWD`, and `CURLFTPMETHOD_SINGLECWD`. Available as of cURL 7.15.1.
`CURLOPT_FTP_SSL` (int)
`CURLOPT_FTP_USE_EPRT` (int)	`true` to use EPRT (and LPRT) when doing active FTP downloads. Use `false` to disable EPRT and LPRT and use PORT only.
`CURLOPT_FTP_USE_EPSV` (int)	`true` to first try an EPSV command for FTP transfers before reverting back to PASV. Set to `false` to disable EPSV.
`CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS` (int)	Head start for ipv6 for the happy eyeballs algorithm. Happy eyeballs attempts to connect to both IPv4 and IPv6 addresses for dual-stack hosts, preferring IPv6 first for timeout milliseconds. Defaults to CURL_HET_DEFAULT, which is currently 200 milliseconds. Available as of PHP 7.3.0 and cURL 7.59.0
`CURLOPT_HAPROXYPROTOCOL` (int)	`true` to send an HAProxy PROXY protocol v1 header at the start of the connection. The default action is not to send this header. Available as of PHP 7.3.0 and cURL 7.60.0
`CURLOPT_HEADER` (int)	`true` to include the header in the output.
`CURLOPT_HEADERFUNCTION` (int)	A callback accepting two parameters. The first is the cURL resource, the second is a string with the header data to be written. The header data must be written by this callback. Return the number of bytes written.
`CURLOPT_HEADEROPT` (int)	Possible values are `CURLHEADER_UNIFIED` or `CURLHEADER_SEPARATE`. Defaults to `CURLHEADER_SEPARATE` as of cURL 7.42.1, and `CURLHEADER_UNIFIED` before. Available as of PHP 7.0.7 and cURL 7.37.0
`CURLOPT_HSTS` (int)	HSTS (HTTP Strict Transport Security) cache file name. Available as of PHP 8.2.0 and cURL 7.74.0
`CURLOPT_HSTS_CTRL` (int)	Controls HSTS (HTTP Strict Transport Security) behavior. Populate the bitmask with the correct set of features to instruct cURL how to handle HSTS for the transfers using this handle. `CURLHSTS_ENABLE` enables the in-memory HSTS cache. If the HSTS cache file is defined, set `CURLHSTS_READONLYFILE` to make the file read-only. Available as of PHP 8.2.0 and cURL 7.74.0
`CURLOPT_HTTP09_ALLOWED` (int)	Whether to allow HTTP/0.9 responses. Defaults to `false` as of libcurl 7.66.0; formerly it defaulted to `true`. Available as of PHP 7.3.15 and 7.4.3, respectively, and cURL 7.64.0
`CURLOPT_HTTP200ALIASES` (int)	An array of HTTP 200 responses that will be treated as valid responses and not as errors. Available as of cURL 7.10.3.
`CURLOPT_HTTPAUTH` (int)	The HTTP authentication method(s) to use. The options are: `CURLAUTH_BASIC`, `CURLAUTH_DIGEST`, `CURLAUTH_GSSNEGOTIATE`, `CURLAUTH_NTLM`, `CURLAUTH_AWS_SIGV4`, `CURLAUTH_ANY`, and `CURLAUTH_ANYSAFE`. The bitwise `\|` (or) operator can be used to combine more than one method. If this is done, cURL will poll the server to see what methods it supports and pick the best one. `CURLAUTH_ANY` sets all bits. cURL will automatically select the one it finds most secure. `CURLAUTH_ANYSAFE` sets all bits except `CURLAUTH_BASIC`. cURL will automatically select the one it finds most secure.
`CURLOPT_HTTPGET` (int)	`true` to reset the HTTP request method to GET. Since GET is the default, this is only necessary if the request method has been changed.
`CURLOPT_HTTPHEADER` (int)	An array of HTTP header fields to set, in the format `array('Content-type: text/plain', 'Content-length: 100')`
`CURLOPT_HTTPPROXYTUNNEL` (int)	`true` to tunnel through a given HTTP proxy.
`CURLOPT_HTTP_CONTENT_DECODING` (int)	`false` to get the raw HTTP response body. Available as of cURL 7.16.2.
`CURLOPT_HTTP_VERSION` (int)	`CURL_HTTP_VERSION_NONE` (default, lets CURL decide which version to use), `CURL_HTTP_VERSION_1_0` (forces HTTP/1.0), `CURL_HTTP_VERSION_1_1` (forces HTTP/1.1), `CURL_HTTP_VERSION_2_0` (attempts HTTP 2), `CURL_HTTP_VERSION_2` (alias of `CURL_HTTP_VERSION_2_0`), `CURL_HTTP_VERSION_2TLS` (attempts HTTP 2 over TLS (HTTPS) only) or `CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE` (issues non-TLS HTTP requests using HTTP/2 without HTTP/1.1 Upgrade).
`CURLOPT_INFILE` (int)	The file that the transfer should be read from when uploading.
`CURLOPT_INFILESIZE` (int)	The expected size, in bytes, of the file when uploading a file to a remote site. Note that using this option will not stop libcurl from sending more data, as exactly what is sent depends on `CURLOPT_READFUNCTION`.
`CURLOPT_INTERFACE` (int)	The name of the outgoing network interface to use. This can be an interface name, an IP address or a host name.
`CURLOPT_IPRESOLVE` (int)	Allows an application to select what kind of IP addresses to use when resolving host names. This is only interesting when using host names that resolve addresses using more than one version of IP, possible values are `CURL_IPRESOLVE_WHATEVER`, `CURL_IPRESOLVE_V4`, `CURL_IPRESOLVE_V6`, by default `CURL_IPRESOLVE_WHATEVER`. Available as of cURL 7.10.8.
`CURLOPT_ISSUERCERT_BLOB` (int)	Issuer SSL certificate from memory blob. Available as of PHP 8.1.0 and cURL 7.71.0.
`CURLOPT_KEEP_SENDING_ON_ERROR` (int)	`true` to keep sending the request body if the HTTP code returned is equal to or larger than 300. The default action would be to stop sending and close the stream or connection. Suitable for manual NTLM authentication. Most applications do not need this option. Available as of PHP 7.3.0 and cURL 7.51.0
`CURLOPT_KEYPASSWD` (int)	The password required to use the `CURLOPT_SSLKEY` or `CURLOPT_SSH_PRIVATE_KEYFILE` private key. Available as of cURL 7.16.1.
`CURLOPT_KRB4LEVEL` (int)	The KRB4 (Kerberos 4) security level. Any of the following values (in order from least to most powerful) are valid: `"clear"`, `"safe"`, `"confidential"`, `"private".`. If the string does not match one of these, `"private"` is used. Setting this option to `null` will disable KRB4 security. Currently KRB4 security only works with FTP transactions.
`CURLOPT_LOGIN_OPTIONS` (int)	Can be used to set protocol specific login options, such as the preferred authentication mechanism via "AUTH=NTLM" or "AUTH=", and should be used in conjunction with the `CURLOPT_USERNAME`* option. Available as of PHP 7.0.7 and cURL 7.34.0
`CURLOPT_LOW_SPEED_LIMIT` (int)	The transfer speed, in bytes per second, that the transfer should be below during the count of `CURLOPT_LOW_SPEED_TIME` seconds before PHP considers the transfer too slow and aborts.
`CURLOPT_LOW_SPEED_TIME` (int)	The number of seconds the transfer speed should be below `CURLOPT_LOW_SPEED_LIMIT` before PHP considers the transfer too slow and aborts.
`CURLOPT_MAIL_RCPT_ALLLOWFAILS` (int)	Available as of PHP 8.2.0 and cURL 7.69.0
`CURLOPT_MAXAGE_CONN` (int)	The maximum idle time allowed for an existing connection to be considered for reuse. Default maximum age is set to `118` seconds. Available as of PHP 8.2.0 and cURL 7.65.0
`CURLOPT_MAXCONNECTS` (int)	The maximum amount of persistent connections that are allowed. When the limit is reached, the oldest one in the cache is closed to prevent increasing the number of open connections.
`CURLOPT_MAXFILESIZE_LARGE` (int)	The maximum file size in bytes allowed to download. If the file requested is found larger than this value, the transfer will not start and `CURLE_FILESIZE_EXCEEDED` will be returned. The file size is not always known prior to download, and for such files this option has no effect even if the file transfer ends up being larger than this given limit. Available as of PHP 8.2.0 and cURL 7.11.0
`CURLOPT_MAXLIFETIME_CONN` (int)	The maximum time in seconds, since the creation of the connection, that is allowed for an existing connection to have for it to be considered for reuse. If a connection is found in the cache that is older than this value, it will instead be closed once any in-progress transfers are complete. Default is 0 seconds, meaning the option is disabled and all connections are eligible for reuse. Available as of PHP 8.2.0 and cURL 7.80.0
`CURLOPT_MAXREDIRS` (int)	The maximum amount of HTTP redirections to follow. Use this option alongside `CURLOPT_FOLLOWLOCATION`. Default value of `20` is set to prevent infinite redirects. Setting to `-1` allows inifinite redirects, and `0` refuses all redirects.
`CURLOPT_MAX_RECV_SPEED_LARGE` (int)	If a download exceeds this speed (counted in bytes per second) on cumulative average during the transfer, the transfer will pause to keep the average rate less than or equal to the parameter value. Defaults to unlimited speed. Available as of cURL 7.15.5
`CURLOPT_MAX_SEND_SPEED_LARGE` (int)	If an upload exceeds this speed (counted in bytes per second) on cumulative average during the transfer, the transfer will pause to keep the average rate less than or equal to the parameter value. Defaults to unlimited speed. Available as of cURL 7.15.5
`CURLOPT_MIME_OPTIONS` (int)	Available as of PHP 8.3.0 and cURL 7.81.0
`CURLOPT_MUTE` (int)	`true` to be completely silent with regards to the cURL functions. Removed as of cURL 7.15.5; use `CURLOPT_RETURNTRANSFER` instead.
`CURLOPT_NETRC` (int)	`true` to scan the `~/.netrc` file to find a username and password for the remote site that a connection is being established with.
`CURLOPT_NOBODY` (int)	`true` to exclude the body from the output. Request method is then set to HEAD. Changing this to `false` does not change it to GET.
`CURLOPT_NOPROGRESS` (int)	`true` to disable the progress meter for cURL transfers. Note: PHP automatically sets this option to `true`, this should only be changed for debugging purposes.
`CURLOPT_NOSIGNAL` (int)	`true` to ignore any cURL function that causes a signal to be sent to the PHP process. This is turned on by default in multi-threaded SAPIs so timeout options can still be used. Available as of cURL 7.10.
`CURLOPT_PASSWDFUNCTION` (int)	A callback accepting three parameters. The first is the cURL resource, the second is a string containing a password prompt, and the third is the maximum password length. Return the string containing the password. Removed as of PHP 7.3.0.
`CURLOPT_PASSWORD` (int)	The password to use in authentication. Available as of cURL 7.19.1.
`CURLOPT_PATH_AS_IS` (int)	`true` to not handle dot dot sequences. Available as of PHP 7.0.7 and cURL 7.42.0
`CURLOPT_PINNEDPUBLICKEY` (int)	Set the pinned public key. The string can be the file name of your pinned public key. The file format expected is "PEM" or "DER". The string can also be any number of base64 encoded sha256 hashes preceded by "sha256//" and separated by ";". Available as of PHP 7.0.7 and cURL 7.39.0
`CURLOPT_PIPEWAIT` (int)	`true` to wait for pipelining/multiplexing. Available as of PHP 7.0.7 and cURL 7.43.0
`CURLOPT_PORT` (int)	An alternative port number to connect to.
`CURLOPT_POST` (int)	`true` to do a regular HTTP POST. This POST is the normal `application/x-www-form-urlencoded` kind, most commonly used by HTML forms.
`CURLOPT_POSTFIELDS` (int)	The full data to post in a HTTP "POST" operation. This parameter can either be passed as a urlencoded string like '`para1=val1&para2=val2&...`' or as an array with the field name as key and field data as value. If `value` is an array, the `Content-Type` header will be set to `multipart/form-data`. Files can be sent using CURLFile or CURLStringFile, in which case `value` must be an array.
`CURLOPT_POSTQUOTE` (int)	An array of FTP commands to execute on the server after the FTP request has been performed.
`CURLOPT_POSTREDIR` (int)	A bitmask of 1 (301 Moved Permanently), 2 (302 Found) and 4 (303 See Other) if the HTTP POST method should be maintained when `CURLOPT_FOLLOWLOCATION` is set and a specific type of redirect occurs. Available as of cURL 7.19.1.
`CURLOPT_PRE_PROXY` (int)	Set a string holding the host name or dotted numerical IP address to be used as the preproxy that curl connects to before it connects to the HTTP(S) proxy specified in the `CURLOPT_PROXY` option for the upcoming request. The preproxy can only be a SOCKS proxy and it should be prefixed with `[scheme]://` to specify which kind of socks is used. A numerical IPv6 address must be written within [brackets]. Setting the preproxy to an empty string explicitly disables the use of a preproxy. To specify port number in this string, append `:[port]` to the end of the host name. The proxy's port number may optionally be specified with the separate option `CURLOPT_PROXYPORT`. Defaults to using port 1080 for proxies if a port is not specified. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PRIVATE` (int)	Any data that should be associated with this cURL handle. This data can subsequently be retrieved with the `CURLINFO_PRIVATE` option of curl_getinfo(). cURL does nothing with this data. When using a cURL multi handle, this private data is typically a unique key to identify a standard cURL handle. Available as of cURL 7.10.3.
`CURLOPT_PROGRESSFUNCTION` (int)	A callback accepting five parameters. The first is the cURL resource, the second is the total number of bytes expected to be downloaded in this transfer, the third is the number of bytes downloaded so far, the fourth is the total number of bytes expected to be uploaded in this transfer, and the fifth is the number of bytes uploaded so far. Note: The callback is only called when the `CURLOPT_NOPROGRESS` option is set to `false`. Return a non-zero value to abort the transfer. In which case, the transfer will set a `CURLE_ABORTED_BY_CALLBACK` error.
`CURLOPT_PROTOCOLS` (int)	Bitmask of *`CURLPROTO_` values. If used, this bitmask limits what protocols libcurl may use in the transfer. This allows you to have a libcurl built to support a wide range of protocols but still limit specific transfers to only be allowed to use a subset of them. By default libcurl will accept all protocols it supports. See also `CURLOPT_REDIR_PROTOCOLS`. Valid protocol options are: `CURLPROTO_HTTP`, `CURLPROTO_HTTPS`, `CURLPROTO_FTP`, `CURLPROTO_FTPS`, `CURLPROTO_SCP`, `CURLPROTO_SFTP`, `CURLPROTO_TELNET`, `CURLPROTO_LDAP`, `CURLPROTO_LDAPS`, `CURLPROTO_DICT`, `CURLPROTO_FILE`, `CURLPROTO_TFTP`, `CURLPROTO_MQTT`, `CURLPROTO_ALL`** Available as of cURL 7.19.4.
`CURLOPT_PROTOCOLS_STR` (int)	Available as of PHP 8.3.0 and cURL 7.85.0
`CURLOPT_PROXY` (int)	The HTTP proxy to tunnel requests through.
`CURLOPT_PROXYAUTH` (int)	The HTTP authentication method(s) to use for the proxy connection. Use the same bitmasks as described in `CURLOPT_HTTPAUTH`. For proxy authentication, only `CURLAUTH_BASIC` and `CURLAUTH_NTLM` are currently supported. Available as of cURL 7.10.7.
`CURLOPT_PROXYHEADER` (int)	An array of custom HTTP headers to pass to proxies. Available as of PHP 7.0.7 and cURL 7.37.0
`CURLOPT_PROXYPORT` (int)	The port number of the proxy to connect to. This port number can also be set in `CURLOPT_PROXY`.
`CURLOPT_PROXYTYPE` (int)	Either `CURLPROXY_HTTP` (default), `CURLPROXY_SOCKS4`, `CURLPROXY_SOCKS5`, `CURLPROXY_SOCKS4A` or `CURLPROXY_SOCKS5_HOSTNAME`. Available as of cURL 7.10.
`CURLOPT_PROXYUSERPWD` (int)	A username and password formatted as `"[username]:[password]"` to use for the connection to the proxy.
`CURLOPT_PROXY_CAINFO` (int)	The path to proxy Certificate Authority (CA) bundle. Set the path as a string naming a file holding one or more certificates to verify the HTTPS proxy with. This option is for connecting to an HTTPS proxy, not an HTTPS server. Defaults set to the system path where libcurl's cacert bundle is assumed to be stored. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_CAINFO_BLOB` (int)	The name of a PEM file holding one or more certificates to verify the HTTPS proxy with. This option is for connecting to an HTTPS proxy, not an HTTPS server. Defaults set to the system path where libcurl's cacert bundle is assumed to be stored. Available as of PHP 8.2.0 and cURL 7.77.0
`CURLOPT_PROXY_CAPATH` (int)	The directory holding multiple CA certificates to verify the HTTPS proxy with. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_CRLFILE` (int)	Set the file name with the concatenation of CRL (Certificate Revocation List) in PEM format to use in the certificate validation that occurs during the SSL exchange. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_ISSUERCERT` (int)	Proxy issuer SSL certificate filename. Available as of PHP 8.1.0 and cURL 7.71.0.
`CURLOPT_PROXY_ISSUERCERT_BLOB` (int)	Proxy issuer SSL certificate from memory blob. Available as of PHP 8.1.0 and cURL 7.71.0.
`CURLOPT_PROXY_KEYPASSWD` (int)	Set the string be used as the password required to use the `CURLOPT_PROXY_SSLKEY` private key. You never needed a passphrase to load a certificate but you need one to load your private key. This option is for connecting to an HTTPS proxy, not an HTTPS server. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_PINNEDPUBLICKEY` (int)	Set the pinned public key for HTTPS proxy. The string can be the file name of your pinned public key. The file format expected is "PEM" or "DER". The string can also be any number of base64 encoded sha256 hashes preceded by "sha256//" and separated by ";". Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SERVICE_NAME` (int)	The proxy authentication service name. Available as of PHP 7.0.7, cURL 7.43.0 (for HTTP proxies) and cURL 7.49.0 (for SOCKS5 proxies).
`CURLOPT_PROXY_SSLCERT` (int)	The file name of your client certificate used to connect to the HTTPS proxy. The default format is "P12" on Secure Transport and "PEM" on other engines, and can be changed with `CURLOPT_PROXY_SSLCERTTYPE`. With NSS or Secure Transport, this can also be the nickname of the certificate you wish to authenticate with as it is named in the security database. If you want to use a file from the current directory, please precede it with "./" prefix, in order to avoid confusion with a nickname. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSLCERTTYPE` (int)	The format of your client certificate used when connecting to an HTTPS proxy. Supported formats are "PEM" and "DER", except with Secure Transport. OpenSSL (versions 0.9.3 and later) and Secure Transport (on iOS 5 or later, or OS X 10.7 or later) also support "P12" for PKCS#12-encoded files. Defaults to "PEM". Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSLCERT_BLOB` (int)	SSL proxy client certificate from memory blob. Available as of PHP 8.1.0 and cURL 7.71.0.
`CURLOPT_PROXY_SSLKEY` (int)	The file name of your private key used for connecting to the HTTPS proxy. The default format is "PEM" and can be changed with `CURLOPT_PROXY_SSLKEYTYPE`. (iOS and Mac OS X only) This option is ignored if curl was built against Secure Transport. Available if built TLS enabled. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSLKEYTYPE` (int)	The format of your private key. Supported formats are "PEM", "DER" and "ENG". Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSLKEY_BLOB` (int)	Private key for proxy cert from memory blob. Available as of PHP 8.1.0 and cURL 7.71.0.
`CURLOPT_PROXY_SSLVERSION` (int)	One of `CURL_SSLVERSION_DEFAULT`, `CURL_SSLVERSION_TLSv1`, `CURL_SSLVERSION_TLSv1_0`, `CURL_SSLVERSION_TLSv1_1`, `CURL_SSLVERSION_TLSv1_2`, `CURL_SSLVERSION_TLSv1_3`, `CURL_SSLVERSION_MAX_DEFAULT`, `CURL_SSLVERSION_MAX_TLSv1_0`, `CURL_SSLVERSION_MAX_TLSv1_1`, `CURL_SSLVERSION_MAX_TLSv1_2`, `CURL_SSLVERSION_MAX_TLSv1_3`, `CURL_SSLVERSION_SSLv3` . Warning It is better to not set this option and leave the default `CURL_SSLVERSION_DEFAULT` which will attempt to figure out the remote SSL protocol version. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSL_CIPHER_LIST` (int)	The list of ciphers to use for the connection to the HTTPS proxy. The list must be syntactically correct, it consists of one or more cipher strings separated by colons. Commas or spaces are also acceptable separators but colons are normally used, !, - and + can be used as operators. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSL_OPTIONS` (int)	Set proxy SSL behavior options, which is a bitmask of the following constants: `CURLSSLOPT_ALLOW_BEAST`, `CURLSSLOPT_NO_REVOKE`, `CURLSSLOPT_NO_PARTIALCHAIN` Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSL_VERIFYHOST` (int)	Set to `2` to verify in the HTTPS proxy's certificate name fields against the proxy name. When set to `0` the connection succeeds regardless of the names used in the certificate. Use that ability with caution! `1` treated as a debug option in curl 7.28.0 and earlier. From curl 7.28.1 to 7.65.3 `CURLE_BAD_FUNCTION_ARGUMENT` is returned. From curl 7.66.0 onwards `1` and `2` is treated as the same value. In production environments the value of this option should be kept at `2` (default value). Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_SSL_VERIFYPEER` (int)	`false` to stop cURL from verifying the peer's certificate. Alternate certificates to verify against can be specified with the `CURLOPT_CAINFO` option or a certificate directory can be specified with the `CURLOPT_CAPATH` option. When set to false, the peer certificate verification succeeds regardless. `true` by default. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_TLS13_CIPHERS` (int)	The list of cipher suites to use for the TLS 1.3 connection to a proxy. The list must be syntactically correct, it consists of one or more cipher suite strings separated by colons. This option is currently used only when curl is built to use OpenSSL 1.1.1 or later. If you are using a different SSL backend you can try setting TLS 1.3 cipher suites by using the `CURLOPT_PROXY_SSL_CIPHER_LIST` option. Available when built with OpenSSL >= 1.1.1. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLOPT_PROXY_TLSAUTH_PASSWORD` (int)	The password to use for the TLS authentication method specified with the `CURLOPT_PROXY_TLSAUTH_TYPE` option. Requires that the `CURLOPT_PROXY_TLSAUTH_USERNAME` option to also be set. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_TLSAUTH_TYPE` (int)	The method of the TLS authentication used for the HTTPS connection. Supported method is `"SRP"`. Note: Secure Remote Password (SRP) authentication for TLS provides mutual authentication if both sides have a shared secret. To use TLS-SRP, you must also set the `CURLOPT_PROXY_TLSAUTH_USERNAME` and `CURLOPT_PROXY_TLSAUTH_PASSWORD` options. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PROXY_TLSAUTH_USERNAME` (int)	The username to use for the HTTPS proxy TLS authentication method specified with the `CURLOPT_PROXY_TLSAUTH_TYPE` option. Requires that the `CURLOPT_PROXY_TLSAUTH_PASSWORD` option to also be set. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLOPT_PUT` (int)	`true` to HTTP PUT a file. The file to PUT must be set with `CURLOPT_INFILE` and `CURLOPT_INFILESIZE`.
`CURLOPT_QUICK_EXIT` (int)	Available as of PHP 8.3.0 and cURL 7.87.0
`CURLOPT_QUOTE` (int)	An array of FTP commands to execute on the server prior to the FTP request.
`CURLOPT_RANDOM_FILE` (int)	A filename to be used to seed the random number generator for SSL.
`CURLOPT_RANGE` (int)	Range(s) of data to retrieve in the format `"X-Y"` where X or Y are optional. HTTP transfers also support several intervals, separated with commas in the format `"X-Y,N-M"`.
`CURLOPT_READFUNCTION` (int)	A callback accepting three parameters. The first is the cURL resource, the second is a stream resource provided to cURL through the option `CURLOPT_INFILE`, and the third is the maximum amount of data to be read. The callback must return a string with a length equal or smaller than the amount of data requested, typically by reading it from the passed stream resource. It should return an empty string to signal `EOF`.
`CURLOPT_REDIR_PROTOCOLS` (int)	Bitmask of *`CURLPROTO_` values. If used, this bitmask limits what protocols libcurl may use in a transfer that it follows to in a redirect when `CURLOPT_FOLLOWLOCATION` is enabled. This allows you to limit specific transfers to only be allowed to use a subset of protocols in redirections. By default libcurl will allow all protocols except for FILE and SCP. This is a difference compared to pre-7.19.4 versions which unconditionally would follow to all protocols supported. See also `CURLOPT_PROTOCOLS`** for protocol constant values. Available as of cURL 7.19.4.
`CURLOPT_REDIR_PROTOCOLS_STR` (int)	Available as of PHP 8.3.0 and cURL 7.85.0.
`CURLOPT_REFERER` (int)	The contents of the `"Referer: "` header to be used in a HTTP request.
`CURLOPT_REQUEST_TARGET` (int)	Available as of PHP 7.3.0 and cURL 7.55.0.
`CURLOPT_RESOLVE` (int)	Provide a custom address for a specific host and port pair. An array of hostname, port, and IP address strings, each element separated by a colon. In the format: `array("example.com:80:127.0.0.1")` Available as of cURL 7.21.3.
`CURLOPT_RESUME_FROM` (int)	The offset, in bytes, to resume a transfer from.
`CURLOPT_RETURNTRANSFER` (int)	`true` to return the transfer as a string of the return value of curl_exec() instead of outputting it directly.
`CURLOPT_SAFE_UPLOAD` (int)	Always `true`, what disables support for the `@` prefix for uploading files in `CURLOPT_POSTFIELDS`, which means that values starting with `@` can be safely passed as fields. CURLFile may be used for uploads instead.
`CURLOPT_SASL_AUTHZID` (int)	The authorization identity (authzid) for the transfer. Only applicable to the PLAIN SASL authentication mechanism where it is optional. When not specified, only the authentication identity (authcid) as specified by the username will be sent to the server, along with the password. The server will derive the authzid from the authcid when not provided, which it will then use internally. Available as of PHP 8.2.0 and cURL 7.66.0
`CURLOPT_SASL_IR` (int)	`true` to enable sending the initial response in the first packet. Available as of PHP 7.0.7 and cURL 7.31.0
`CURLOPT_SERVICE_NAME` (int)	The authentication service name. Available as of PHP 7.0.7 and cURL 7.43.0
`CURLOPT_SHARE` (int)	A result of curl_share_init(). Makes the cURL handle to use the data from the shared handle.
`CURLOPT_SOCKS5_AUTH` (int)	The SOCKS5 authentication method(s) to use. The options are: `CURLAUTH_BASIC`, `CURLAUTH_GSSAPI`, `CURLAUTH_NONE`. The bitwise `\|` (or) operator can be used to combine more than one method. If this is done, cURL will poll the server to see what methods it supports and pick the best one. `CURLAUTH_BASIC` allows username/password authentication. `CURLAUTH_GSSAPI` allows GSS-API authentication. `CURLAUTH_NONE` allows no authentication. Defaults to `CURLAUTH_BASIC\|CURLAUTH_GSSAPI`. Set the actual username and password with the `CURLOPT_PROXYUSERPWD` option. Available as of PHP 7.3.0 and cURL 7.55.0
`CURLOPT_SSH_AUTH_TYPES` (int)	A bitmask consisting of one or more of `CURLSSH_AUTH_PUBLICKEY`, `CURLSSH_AUTH_PASSWORD`, `CURLSSH_AUTH_HOST`, `CURLSSH_AUTH_KEYBOARD`. Set to `CURLSSH_AUTH_ANY` to let libcurl pick one. Available as of cURL 7.16.1.
`CURLOPT_SSH_COMPRESSION` (int)	`true` to enable built-in SSH compression. This is a request, not an order; the server may or may not do it. Available as of PHP 7.3.0 and cURL 7.56.0
`CURLOPT_SSH_HOSTKEYFUNCTION` (int)	Available as of PHP 8.3.0 and cURL 7.84.0
`CURLOPT_SSH_HOST_PUBLIC_KEY_MD5` (int)	A string containing 32 hexadecimal digits. The string should be the MD5 checksum of the remote host's public key, and libcurl will reject the connection to the host unless the md5sums match. This option is only for SCP and SFTP transfers. Available as of cURL 7.17.1.
`CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256` (int)	Base64-encoded SHA256 hash of the remote host's public key. The transfer will fail if the given hash does not match the hash the remote host provides. Available as of PHP 8.2.0 and cURL 7.80.0
`CURLOPT_SSH_PRIVATE_KEYFILE` (int)	The file name for your private key. If not used, libcurl defaults to $HOME/.ssh/id_dsa if the HOME environment variable is set, and just "id_dsa" in the current directory if HOME is not set. If the file is password-protected, set the password with `CURLOPT_KEYPASSWD`. Available as of cURL 7.16.1.
`CURLOPT_SSH_PUBLIC_KEYFILE` (int)	The file name for your public key. If not used, libcurl defaults to $HOME/.ssh/id_dsa.pub if the HOME environment variable is set, and just "id_dsa.pub" in the current directory if HOME is not set. Available as of cURL 7.16.1.
`CURLOPT_SSLCERT` (int)	The name of a file containing a PEM formatted certificate.
`CURLOPT_SSLCERTPASSWD` (int)	The password required to use the `CURLOPT_SSLCERT` certificate.
`CURLOPT_SSLCERTTYPE` (int)	The format of the certificate. Supported formats are `"PEM"` (default), `"DER"`, and `"ENG"`. As of OpenSSL 0.9.3, `"P12"` (for PKCS#12-encoded files) is also supported. Available as of cURL 7.9.3.
`CURLOPT_SSLCERT_BLOB` (int)	SSL client certificate from memory blob. Available as of PHP 8.1.0 and cURL 7.71.0.
`CURLOPT_SSLENGINE` (int)	The identifier for the crypto engine of the private SSL key specified in `CURLOPT_SSLKEY`.
`CURLOPT_SSLENGINE_DEFAULT` (int)	The identifier for the crypto engine used for asymmetric crypto operations.
`CURLOPT_SSLKEY` (int)	The name of a file containing a private SSL key.
`CURLOPT_SSLKEYPASSWD` (int)	The secret password needed to use the private SSL key specified in `CURLOPT_SSLKEY`. Note: Since this option contains a sensitive password, remember to keep the PHP script it is contained within safe.
`CURLOPT_SSLKEYTYPE` (int)	The key type of the private SSL key specified in `CURLOPT_SSLKEY`. Supported key types are `"PEM"` (default), `"DER"`, and `"ENG"`.
`CURLOPT_SSLKEY_BLOB` (int)	Private key for client cert from memory blob. Available as of PHP 8.1.0 and cURL 7.71.0.
`CURLOPT_SSLVERSION` (int)	One of `CURL_SSLVERSION_DEFAULT`, `CURL_SSLVERSION_TLSv1`, `CURL_SSLVERSION_SSLv2`, `CURL_SSLVERSION_SSLv3`, `CURL_SSLVERSION_TLSv1_0`, `CURL_SSLVERSION_TLSv1_1`, `CURL_SSLVERSION_TLSv1_2`, `CURL_SSLVERSION_TLSv1_3` . The maximum TLS version can be set by using one of the *`CURL_SSLVERSION_MAX_` constants. It is also possible to bitwise OR one of the `CURL_SSLVERSION_`* constants with one of the *`CURL_SSLVERSION_MAX_`. `CURL_SSLVERSION_MAX_DEFAULT` (the maximum version supported by the library), `CURL_SSLVERSION_MAX_TLSv1_0`, `CURL_SSLVERSION_MAX_TLSv1_1`, `CURL_SSLVERSION_MAX_TLSv1_2`, `CURL_SSLVERSION_MAX_TLSv1_3` . Warning It is better to not set this option and leave the defaults. As setting this to `CURL_SSLVERSION_SSLv2` or `CURL_SSLVERSION_SSLv3`** is very dangerous, given the known vulnerabilities in SSLv2 and SSLv3.
`CURLOPT_SSL_CIPHER_LIST` (int)	A list of ciphers to use for SSL. For example, `RC4-SHA` and `TLSv1` are valid cipher lists.
`CURLOPT_SSL_EC_CURVES` (int)	A colon delimited list of elliptic curve algorithms. For example, `X25519:P-521` is a valid list of two elliptic curves. This option defines the client's key exchange algorithms in the SSL handshake, if the SSL backend cURL is built to use supports it. Available as of PHP 8.2.0 and cURL 7.73.0
`CURLOPT_SSL_ENABLE_ALPN` (int)	`false` to disable ALPN in the SSL handshake (if the SSL backend libcurl is built to use supports it), which can be used to negotiate http2. Available as of PHP 7.0.7 and cURL 7.36.0
`CURLOPT_SSL_ENABLE_NPN` (int)	`false` to disable NPN in the SSL handshake (if the SSL backend libcurl is built to use supports it), which can be used to negotiate http2. Available as of PHP 7.0.7 and cURL 7.36.0
`CURLOPT_SSL_FALSESTART` (int)	`true` to enable TLS false start. Available as of PHP 7.0.7 and cURL 7.42.0
`CURLOPT_SSL_OPTIONS` (int)	Set SSL behavior options, which is a bitmask of the following constants: `CURLSSLOPT_ALLOW_BEAST`, `CURLSSLOPT_NO_REVOKE`, `CURLSSLOPT_AUTO_CLIENT_CERT`, `CURLSSLOPT_NATIVE_CA`, `CURLSSLOPT_NO_PARTIALCHAIN`, `CURLSSLOPT_REVOKE_BEST_EFFORT` Available as of PHP 7.0.7. and cURL 7.25.0
`CURLOPT_SSL_VERIFYHOST` (int)	`2` to verify that a Common Name field or a Subject Alternate Name field in the SSL peer certificate matches the provided hostname. `0` to not check the names. `1` should not be used. In production environments the value of this option should be kept at `2` (default value). Support for value `1` removed in cURL 7.28.1.
`CURLOPT_SSL_VERIFYPEER` (int)	`false` to stop cURL from verifying the peer's certificate. Alternate certificates to verify against can be specified with the `CURLOPT_CAINFO` option or a certificate directory can be specified with the `CURLOPT_CAPATH` option. `true` by default as of cURL 7.10. Default bundle installed as of cURL 7.10.
`CURLOPT_SSL_VERIFYSTATUS` (int)	`true` to verify the certificate's status. Available as of PHP 7.0.7 and cURL 7.41.0
`CURLOPT_STDERR` (int)	An alternative location to output errors to instead of `STDERR`.
`CURLOPT_STREAM_WEIGHT` (int)	Set the numerical stream weight (a number between 1 and 256). Available as of PHP 7.0.7 and cURL 7.46.0
`CURLOPT_SUPPRESS_CONNECT_HEADERS` (int)	`true` to suppress proxy CONNECT response headers from the user callback functions `CURLOPT_HEADERFUNCTION` and `CURLOPT_WRITEFUNCTION`, when `CURLOPT_HTTPPROXYTUNNEL` is used and a CONNECT request is made. Available as of PHP 7.3.0 and cURL 7.54.0
`CURLOPT_TCP_FASTOPEN` (int)	`true` to enable TCP Fast Open. Available as of PHP 7.0.7 and cURL 7.49.0
`CURLOPT_TCP_KEEPALIVE` (int)	If set to `1`, TCP keepalive probes will be sent. The delay and frequency of these probes can be controlled by the `CURLOPT_TCP_KEEPIDLE` and `CURLOPT_TCP_KEEPINTVL` options, provided the operating system supports them. If set to `0` (default) keepalive probes are disabled. Available as of cURL 7.25.0
`CURLOPT_TCP_KEEPIDLE` (int)	Sets the delay, in seconds, that the operating system will wait while the connection is idle before sending keepalive probes, if `CURLOPT_TCP_KEEPALIVE` is enabled. Not all operating systems support this option. The default is `60`. Available as of cURL 7.25.0
`CURLOPT_TCP_KEEPINTVL` (int)	Sets the interval, in seconds, that the operating system will wait between sending keepalive probes, if `CURLOPT_TCP_KEEPALIVE` is enabled. Not all operating systems support this option. The default is `60`. Available as of cURL 7.25.0
`CURLOPT_TCP_NODELAY` (int)	`true` to disable TCP's Nagle algorithm, which tries to minimize the number of small packets on the network. Available as of cURL 7.11.2.
`CURLOPT_TFTP_NO_OPTIONS` (int)	`true` to not send TFTP options requests. Available as of PHP 7.0.7 and cURL 7.48.0
`CURLOPT_TIMECONDITION` (int)	How `CURLOPT_TIMEVALUE` is treated. Use `CURL_TIMECOND_IFMODSINCE` to return the page only if it has been modified since the time specified in `CURLOPT_TIMEVALUE`. If it hasn't been modified, a `"304 Not Modified"` header will be returned assuming `CURLOPT_HEADER` is `true`. Use `CURL_TIMECOND_IFUNMODSINCE` for the reverse effect. Use `CURL_TIMECOND_NONE` to ignore `CURLOPT_TIMEVALUE` and always return the page. `CURL_TIMECOND_NONE` is the default. Before cURL 7.46.0 the default was `CURL_TIMECOND_IFMODSINCE`.
`CURLOPT_TIMEOUT` (int)	The maximum number of seconds to allow cURL functions to execute.
`CURLOPT_TIMEOUT_MS` (int)	The maximum number of milliseconds to allow cURL functions to execute. If libcurl is built to use the standard system name resolver, that portion of the connect will still use full-second resolution for timeouts with a minimum timeout allowed of one second. Available as of cURL 7.16.2.
`CURLOPT_TIMEVALUE` (int)	The time in seconds since January 1st, 1970. The time will be used by `CURLOPT_TIMECONDITION`.
`CURLOPT_TIMEVALUE_LARGE` (int)	The time in seconds since January 1st, 1970. The time will be used by `CURLOPT_TIMECONDITION`. Defaults to zero. The difference between this option and `CURLOPT_TIMEVALUE` is the type of the argument. On systems where 'long' is only 32 bit wide, this option has to be used to set dates beyond the year 2038. Available as of PHP 7.3.0 and cURL 7.59.0
`CURLOPT_TLS13_CIPHERS` (int)	The list of cipher suites to use for the TLS 1.3 connection. The list must be syntactically correct, it consists of one or more cipher suite strings separated by colons. This option is currently used only when curl is built to use OpenSSL 1.1.1 or later. If you are using a different SSL backend you can try setting TLS 1.3 cipher suites by using the `CURLOPT_SSL_CIPHER_LIST` option. Available when built with OpenSSL >= 1.1.1. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLOPT_TRANSFERTEXT` (int)	`true` to use ASCII mode for FTP transfers. For LDAP, it retrieves data in plain text instead of HTML. On Windows systems, it will not set `STDOUT` to binary mode.
`CURLOPT_UNIX_SOCKET_PATH` (int)	Enables the use of Unix domain sockets as connection endpoint and sets the path to the given string. Available as of PHP 7.0.7 and cURL 7.40.0
`CURLOPT_UNRESTRICTED_AUTH` (int)	`true` to keep sending the username and password when following locations (using `CURLOPT_FOLLOWLOCATION`), even when the hostname has changed.
`CURLOPT_UPKEEP_INTERVAL_MS` (int)	Some protocols have "connection upkeep" mechanisms. These mechanisms usually send some traffic on existing connections in order to keep them alive. This option defines the connection upkeep interval. Currently, the only protocol with a connection upkeep mechanism is HTTP/2. When the connection upkeep interval is exceeded, an HTTP/2 PING frame is sent on the connection. Default is `60` seconds. Available as of PHP 8.2.0 and cURL 7.62.0
`CURLOPT_UPLOAD` (int)	`true` to prepare for an upload.
`CURLOPT_UPLOAD_BUFFERSIZE` (int)	Preferred buffer size in bytes for the cURL upload buffer. The upload buffer size by default is 64 kilobytes. The maximum buffer size allowed to be set is 2 megabytes. The minimum buffer size allowed to be set is 16 kilobytes. Available as of PHP 8.2.0 and cURL 7.62.0
`CURLOPT_URL` (int)	The URL to fetch. This can also be set when initializing a session with curl_init().
`CURLOPT_USERAGENT` (int)	The contents of the `"User-Agent: "` header to be used in a HTTP request.
`CURLOPT_USERNAME` (int)	The user name to use in authentication. Available as of cURL 7.19.1
`CURLOPT_USERPWD` (int)	A username and password formatted as `"[username]:[password]"` to use for the connection.
`CURLOPT_VERBOSE` (int)	`true` to output verbose information. Writes output to `STDERR`, or the file specified using `CURLOPT_STDERR`.
`CURLOPT_WRITEFUNCTION` (int)	A callback accepting two parameters. The first is the cURL resource, and the second is a string with the data to be written. The data must be saved by this callback. It must return the exact number of bytes written or the transfer will be aborted with an error.
`CURLOPT_WRITEHEADER` (int)	The file that the header part of the transfer is written to.
`CURLOPT_WS_OPTIONS` (int)	Available as of PHP 8.3.0 and cURL 7.86.0
`CURLOPT_XFERINFOFUNCTION` (int)	A callback accepting two parameters. Has a similar purpose as `CURLOPT_PROGRESSFUNCTION` but is more modern and the preferred option from cURL. Available as of PHP 8.2.0 and cURL 7.32.0.
`CURLOPT_XOAUTH2_BEARER` (int)	Specifies the OAuth 2.0 access token. Available as of PHP 7.0.7 and cURL 7.33.0

curl_share_setopt()

Constants	Description
`CURL_LOCK_DATA_CONNECT` (int)	Shares/unshares the connection cache. Available as of PHP 7.3.0 and cURL 7.10.0
`CURL_LOCK_DATA_COOKIE` (int)	Shares/unshares cookie data.
`CURL_LOCK_DATA_DNS` (int)	Shares/unshares DNS cache. Note that when you use cURL multi handles, all handles added to the same multi handle will share DNS cache by default.
`CURL_LOCK_DATA_PSL` (int)	Shares/unshares the Public Suffix List. Available as of PHP 7.3.0 and cURL 7.61.0
`CURL_LOCK_DATA_SSL_SESSION` (int)	Shares/unshares SSL session IDs, reducing the time spent on the SSL handshake when reconnecting to the same server. Note that SSL session IDs are reused within the same handle by default.
`CURLSHOPT_NONE` (int)
`CURLSHOPT_SHARE` (int)	Specifies a type of data that should be shared.
`CURLSHOPT_UNSHARE` (int)	Specifies a type of data that will be no longer shared.

curl_getinfo()

Constants	Description
`CURLINFO_APPCONNECT_TIME` (int)	Time in seconds it took from the start until the SSL/SSH connect/handshake to the remote host was completed
`CURLINFO_APPCONNECT_TIME_T` (int)	Time, in microseconds, it took from the start until the SSL/SSH connect/handshake to the remote host was completed. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLINFO_CAINFO` (int)	Default built-in CA certificate path. Available as of PHP 8.3.0 and cURL 7.84.0
`CURLINFO_CAPATH` (int)	Default built-in CA path string. Available as of PHP 8.3.0 and cURL 7.84.0
`CURLINFO_CERTINFO` (int)	TLS certificate chain
`CURLINFO_CONDITION_UNMET` (int)	Info on unmet time conditional
`CURLINFO_CONNECT_TIME` (int)	Time in seconds it took to establish the connection
`CURLINFO_CONNECT_TIME_T` (int)	Total time taken, in microseconds, from the start until the connection to the remote host (or proxy) was completed. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLINFO_CONTENT_LENGTH_DOWNLOAD` (int)	Content length of download, read from Content-Length: field
`CURLINFO_CONTENT_LENGTH_DOWNLOAD_T` (int)	The content-length of the download. This is the value read from the Content-Length: field. -1 if the size isn't known. Available as of PHP 7.3.0 and cURL 7.55.0
`CURLINFO_CONTENT_LENGTH_UPLOAD` (int)	Specified size of upload
`CURLINFO_CONTENT_LENGTH_UPLOAD_T` (int)	The specified size of the upload. -1 if the size isn't known. Available as of PHP 7.3.0 and cURL 7.55.0
`CURLINFO_CONTENT_TYPE` (int)	`Content-Type` of the requested document. NULL indicates server did not send valid `Content-Type` header
`CURLINFO_COOKIELIST` (int)	All known cookies
`CURLINFO_EFFECTIVE_METHOD` (int)	Get the last used HTTP method.
`CURLINFO_EFFECTIVE_URL` (int)	Last effective URL
`CURLINFO_FILETIME` (int)	Remote time of the retrieved document, with the `CURLOPT_FILETIME` enabled; if -1 is returned the time of the document is unknown
`CURLINFO_FILETIME_T` (int)	Remote time of the retrieved document (as Unix timestamp), an alternative to `CURLINFO_FILETIME` to allow systems with 32 bit long variables to extract dates outside of the 32bit timestamp range. Available as of PHP 7.3.0 and cURL 7.59.0
`CURLINFO_FTP_ENTRY_PATH` (int)	Entry path in FTP server
`CURLINFO_HEADER_OUT` (int)	The request string sent. For this to work, add the `CURLINFO_HEADER_OUT` option to the handle by calling curl_setopt()
`CURLINFO_HEADER_SIZE` (int)	Total size of all headers received
`CURLINFO_HTTPAUTH_AVAIL` (int)	Bitmask indicating the authentication method(s) available according to the previous response
`CURLINFO_HTTP_CODE` (int)	The last response code. As of cURL 7.10.8, this is a legacy alias of `CURLINFO_RESPONSE_CODE`.
`CURLINFO_HTTP_CONNECTCODE` (int)	The CONNECT response code
`CURLINFO_HTTP_VERSION` (int)	The version used in the last HTTP connection. The return value will be one of the defined *`CURL_HTTP_VERSION_`** constants or 0 if the version can't be determined. Available as of PHP 7.3.0 and cURL 7.50.0
`CURLINFO_LASTONE` (int)	The last enum value in the underlying `CURLINFO` enum in `libcurl`.
`CURLINFO_LOCAL_IP` (int)	Local (source) IP address of the most recent connection
`CURLINFO_LOCAL_PORT` (int)	Local (source) port of the most recent connection
`CURLINFO_NAMELOOKUP_TIME` (int)	Time in seconds until name resolving was complete
`CURLINFO_NAMELOOKUP_TIME_T` (int)	Time in microseconds from the start until the name resolving was completed. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLINFO_NUM_CONNECTS` (int)	Number of connections curl had to create to achieve the previous transfer
`CURLINFO_OS_ERRNO` (int)	Errno from a connect failure. The number is OS and system specific.
`CURLINFO_PRETRANSFER_TIME` (int)	Time in seconds from start until just before file transfer begins
`CURLINFO_PRETRANSFER_TIME_T` (int)	Time taken from the start until the file transfer is just about to begin, in microseconds. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLINFO_PRIMARY_IP` (int)	IP address of the most recent connection
`CURLINFO_PRIMARY_PORT` (int)	Destination port of the most recent connection
`CURLINFO_PRIVATE` (int)	Private data associated with this cURL handle, previously set with the `CURLOPT_PRIVATE` option of curl_setopt()
`CURLINFO_PROTOCOL` (int)	The protocol used in the last HTTP connection. The returned value will be exactly one of the *`CURLPROTO_`** values. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLINFO_PROXYAUTH_AVAIL` (int)	Bitmask indicating the proxy authentication method(s) available according to the previous response
`CURLINFO_PROXY_ERROR` (int)	The detailed (SOCKS) proxy error code when the most recent transfer returned a `CURLE_PROXY` error. The returned value will be exactly one of the *`CURLPX_` values. The error code will be `CURLPX_OK`** if no response code was available. Available as of PHP 8.2.0 and cURL 7.73.0
`CURLINFO_PROXY_SSL_VERIFYRESULT` (int)	The result of the certificate verification that was requested (using the `CURLOPT_PROXY_SSL_VERIFYPEER` option). Only used for HTTPS proxies. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLINFO_REDIRECT_COUNT` (int)	Number of redirects, with the `CURLOPT_FOLLOWLOCATION` option enabled
`CURLINFO_REDIRECT_TIME` (int)	Time in seconds of all redirection steps before final transaction was started, with the `CURLOPT_FOLLOWLOCATION` option enabled
`CURLINFO_REDIRECT_TIME_T` (int)	Total time, in microseconds, it took for all redirection steps include name lookup, connect, pretransfer and transfer before final transaction was started. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLINFO_REDIRECT_URL` (int)	With the `CURLOPT_FOLLOWLOCATION` option disabled: redirect URL found in the last transaction, that should be requested manually next. With the `CURLOPT_FOLLOWLOCATION` option enabled: this is empty. The redirect URL in this case is available in `CURLINFO_EFFECTIVE_URL`
`CURLINFO_REFERER` (int)	The `Referer` header. Available as of PHP 8.2.0 and cURL 7.76.0
`CURLINFO_REQUEST_SIZE` (int)	Total size of issued requests, currently only for HTTP requests
`CURLINFO_RESPONSE_CODE` (int)	The last response code. Available as of cURL 7.10.8
`CURLINFO_RETRY_AFTER` (int)	The information from the `Retry-After` header, or zero if there was no valid header. Available as of PHP 8.2.0 and cURL 7.66.0
`CURLINFO_RTSP_CLIENT_CSEQ` (int)	Next RTSP client CSeq
`CURLINFO_RTSP_CSEQ_RECV` (int)	Recently received CSeq
`CURLINFO_RTSP_SERVER_CSEQ` (int)	Next RTSP server CSeq
`CURLINFO_RTSP_SESSION_ID` (int)	RTSP session ID
`CURLINFO_SCHEME` (int)	The URL scheme used for the most recent connection. Available as of PHP 7.3.0 and cURL 7.52.0
`CURLINFO_SIZE_DOWNLOAD` (int)	Total number of bytes downloaded
`CURLINFO_SIZE_DOWNLOAD_T` (int)	Total number of bytes that were downloaded. The number is only for the latest transfer and will be reset again for each new transfer. Available as of PHP 7.3.0 and cURL 7.50.0
`CURLINFO_SIZE_UPLOAD` (int)	Total number of bytes uploaded
`CURLINFO_SIZE_UPLOAD_T` (int)	Total number of bytes that were uploaded. Available as of PHP 7.3.0 and cURL 7.50.0
`CURLINFO_SPEED_DOWNLOAD` (int)	Average download speed
`CURLINFO_SPEED_DOWNLOAD_T` (int)	The average download speed in bytes/second that curl measured for the complete download. Available as of PHP 7.3.0 and cURL 7.50.0
`CURLINFO_SPEED_UPLOAD` (int)	Average upload speed
`CURLINFO_SPEED_UPLOAD_T` (int)	The average upload speed in bytes/second that curl measured for the complete upload. Available as of PHP 7.3.0 and cURL 7.50.0
`CURLINFO_SSL_ENGINES` (int)	OpenSSL crypto-engines supported
`CURLINFO_SSL_VERIFYRESULT` (int)	Result of SSL certification verification requested by setting `CURLOPT_SSL_VERIFYPEER`
`CURLINFO_STARTTRANSFER_TIME` (int)	Time in seconds until the first byte is about to be transferred
`CURLINFO_STARTTRANSFER_TIME_T` (int)	Time, in microseconds, it took from the start until the first byte is received. Available as of PHP 7.3.0 and cURL 7.61.0
`CURLINFO_TOTAL_TIME` (int)	Total transaction time in seconds for last transfer
`CURLINFO_TOTAL_TIME_T` (int)	Total time in microseconds for the previous transfer, including name resolving, TCP connect etc. Available as of PHP 7.3.0 and cURL 7.61.0

curl_multi_setopt()

Constants	Description
`CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE` (int)	Specifies the chunk length threshold for pipelining in bytes. Available as of PHP 7.0.7 and cURL 7.30.0
`CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE` (int)	Specifies the size threshold for pipelining penalty in bytes. Available as of PHP 7.0.7 and cURL 7.30.0
`CURLMOPT_MAXCONNECTS` (int)	Specifies the maximum amount of simultaneously open connections that libcurl may cache. By default the size will be enlarged to fit four times the number of handles added via curl_multi_add_handle(). When the cache is full, curl closes the oldest one in the cache to prevent the number of open connections from increasing. Available as of cURL 7.16.3.
`CURLMOPT_MAX_CONCURRENT_STREAMS` (int)	Specifies the maximum number of concurrent streams for connections that cURL should support on connections using HTTP/2. Valid values range from `1` to `2147483647` (`2^31 - 1`). The value passed here would be honored based on other system resources properties. Default is `100`. Available as of PHP 8.2.0 and cURL 7.67.0.
`CURLMOPT_MAX_HOST_CONNECTIONS` (int)	Specifies the maximum number of connections to a single host. Available as of PHP 7.0.7 and cURL 7.30.0
`CURLMOPT_MAX_PIPELINE_LENGTH` (int)	Specifies the maximum number of requests in a pipeline. Available as of PHP 7.0.7 and cURL 7.30.0
`CURLMOPT_MAX_TOTAL_CONNECTIONS` (int)	Specifies the maximum number of simultaneously open connections. Available as of PHP 7.0.7 and cURL 7.30.0
`CURLMOPT_PIPELINING` (int)	Pass 1 to enable or 0 to disable. Enabling pipelining on a multi handle will make it attempt to perform HTTP Pipelining as far as possible for transfers using this handle. This means that adding a second request that can use an already existing connection will "pipe" the second request on the same connection. As of cURL 7.43.0, the value is a bitmask, and passing 2 will try to multiplex the new transfer over an existing HTTP/2 connection. Passing 3 instructs cURL to ask for pipelining and multiplexing independently of each other. As of cURL 7.62.0, setting the pipelining bit has no effect. Instead of integer literals, the CURLPIPE_* constants can also be used. Available as of cURL 7.16.0.
`CURLMOPT_PUSHFUNCTION` (int)	Pass a callable that will be registered to handle server pushes and should have the following signature: pushfunction(resource `$parent_ch`, resource `$pushed_ch`, array `$headers`): int `parent_ch` The parent cURL handle (the request the client made). `pushed_ch` A new cURL handle for the pushed request. `headers` The push promise headers. The push function is supposed to return either `CURL_PUSH_OK` if it can handle the push, or `CURL_PUSH_DENY` to reject it. Available as of PHP 7.1.0 and cURL 7.44.0

cURL protocol constants

Constants	Description
`CURLPROTO_ALL` (int)
`CURLPROTO_DICT` (int)
`CURLPROTO_FILE` (int)
`CURLPROTO_FTP` (int)
`CURLPROTO_FTPS` (int)
`CURLPROTO_GOPHER` (int)
`CURLPROTO_HTTP` (int)
`CURLPROTO_HTTPS` (int)
`CURLPROTO_IMAP` (int)
`CURLPROTO_IMAPS` (int)
`CURLPROTO_LDAP` (int)
`CURLPROTO_LDAPS` (int)
`CURLPROTO_MQTT` (int)	Available as of PHP 8.2.0 and cURL 7.71.0.
`CURLPROTO_POP3` (int)
`CURLPROTO_POP3S` (int)
`CURLPROTO_RTMP` (int)
`CURLPROTO_RTMPE` (int)
`CURLPROTO_RTMPS` (int)
`CURLPROTO_RTMPT` (int)
`CURLPROTO_RTMPTE` (int)
`CURLPROTO_RTMPTS` (int)
`CURLPROTO_RTSP` (int)
`CURLPROTO_SCP` (int)
`CURLPROTO_SFTP` (int)
`CURLPROTO_SMB` (int)	Available as of PHP 7.0.7 and cURL 7.40.0.
`CURLPROTO_SMBS` (int)	Available as of PHP 7.0.7 and cURL 7.40.0.
`CURLPROTO_SMTP` (int)
`CURLPROTO_SMTPS` (int)
`CURLPROTO_TELNET` (int)
`CURLPROTO_TFTP` (int)

cURL error constants

Constants	Description
`CURLE_ABORTED_BY_CALLBACK` (int)	Aborted by callback. A callback returned "abort" to libcurl.
`CURLE_BAD_CALLING_ORDER` (int)
`CURLE_BAD_CONTENT_ENCODING` (int)	Unrecognized transfer encoding.
`CURLE_BAD_DOWNLOAD_RESUME` (int)	The download could not be resumed because the specified offset was out of the file boundary.
`CURLE_BAD_FUNCTION_ARGUMENT` (int)	A function was called with a bad parameter.
`CURLE_BAD_PASSWORD_ENTERED` (int)
`CURLE_COULDNT_CONNECT` (int)	Failed to connect to host or proxy.
`CURLE_COULDNT_RESOLVE_HOST` (int)	Could not resolve host. The given remote host was not resolved.
`CURLE_COULDNT_RESOLVE_PROXY` (int)	Could not resolve proxy. The given proxy host could not be resolved.
`CURLE_FAILED_INIT` (int)	Early initialization code failed. This is likely to be an internal error or problem, or a resource problem where something fundamental could not get done at init time.
`CURLE_FILESIZE_EXCEEDED` (int)	Maximum file size exceeded.
`CURLE_FILE_COULDNT_READ_FILE` (int)	A file given with FILE:// could not be opened. Most likely because the file path does not identify an existing file or due to the lack of appropriate file permissions.
`CURLE_FTP_ACCESS_DENIED` (int)
`CURLE_FTP_BAD_DOWNLOAD_RESUME` (int)
`CURLE_FTP_CANT_GET_HOST` (int)	An internal failure to lookup the host used for the new connection.
`CURLE_FTP_CANT_RECONNECT` (int)
`CURLE_FTP_COULDNT_GET_SIZE` (int)
`CURLE_FTP_COULDNT_RETR_FILE` (int)	This was either a unexpected reply to a 'RETR' command or a zero byte transfer complete.
`CURLE_FTP_COULDNT_SET_ASCII` (int)
`CURLE_FTP_COULDNT_SET_BINARY` (int)
`CURLE_FTP_COULDNT_STOR_FILE` (int)
`CURLE_FTP_COULDNT_USE_REST` (int)	The FTP REST command returned error. This should never happen if the server is sane.
`CURLE_FTP_PARTIAL_FILE` (int)
`CURLE_FTP_PORT_FAILED` (int)	The FTP PORT command returned error. This mostly happens when a good enough address has not been specified for libcurl to use. See `CURLOPT_FTPPORT`.
`CURLE_FTP_QUOTE_ERROR` (int)
`CURLE_FTP_SSL_FAILED` (int)
`CURLE_FTP_USER_PASSWORD_INCORRECT` (int)
`CURLE_FTP_WEIRD_227_FORMAT` (int)	FTP servers return a 227-line as a response to a PASV command. If libcurl fails to parse that line, this return code is passed back.
`CURLE_FTP_WEIRD_PASS_REPLY` (int)	After having sent the FTP password to the server, libcurl expects a proper reply. This error code indicates that an unexpected code was returned.
`CURLE_FTP_WEIRD_PASV_REPLY` (int)	libcurl failed to get a sensible result back from the server as a response to either a PASV or a EPSV command. The server is flawed.
`CURLE_FTP_WEIRD_SERVER_REPLY` (int)	The server sent data libcurl could not parse. This error code is known as `CURLE_WEIRD_SERVER_REPLY` as of cURL 7.51.0.
`CURLE_FTP_WEIRD_USER_REPLY` (int)
`CURLE_FTP_WRITE_ERROR` (int)
`CURLE_FUNCTION_NOT_FOUND` (int)	Function not found. A required zlib function was not found.
`CURLE_GOT_NOTHING` (int)	Nothing was returned from the server, and under the circumstances, getting nothing is considered an error.
`CURLE_HTTP_NOT_FOUND` (int)
`CURLE_HTTP_PORT_FAILED` (int)
`CURLE_HTTP_POST_ERROR` (int)	This is an odd error that mainly occurs due to internal confusion.
`CURLE_HTTP_RANGE_ERROR` (int)
`CURLE_HTTP_RETURNED_ERROR` (int)	This is returned if `CURLOPT_FAILONERROR` is set `true` and the HTTP server returns an error code that is greater than or equal to 400.
`CURLE_LDAP_CANNOT_BIND` (int)	LDAP cannot bind. LDAP bind operation failed.
`CURLE_LDAP_INVALID_URL` (int)
`CURLE_LDAP_SEARCH_FAILED` (int)	LDAP search failed.
`CURLE_LIBRARY_NOT_FOUND` (int)
`CURLE_MALFORMAT_USER` (int)
`CURLE_OBSOLETE` (int)
`CURLE_OK` (int)	All fine. Proceed as usual.
`CURLE_OPERATION_TIMEDOUT` (int)	Operation timeout. The specified time-out period was reached according to the conditions.
`CURLE_OPERATION_TIMEOUTED` (int)
`CURLE_OUT_OF_MEMORY` (int)	A memory allocation request failed.
`CURLE_PARTIAL_FILE` (int)	A file transfer was shorter or larger than expected. This happens when the server first reports an expected transfer size, and then delivers data that does not match the previously given size.
`CURLE_PROXY` (int)	Proxy handshake error. `CURLINFO_PROXY_ERROR` provides extra details on the specific problem. Available as of PHP 8.2.0 and cURL 7.73.0
`CURLE_READ_ERROR` (int)	There was a problem reading a local file or an error returned by the read callback.
`CURLE_RECV_ERROR` (int)	Failure with receiving network data.
`CURLE_SEND_ERROR` (int)	Failed sending network data.
`CURLE_SHARE_IN_USE` (int)
`CURLE_SSH` (int)	An unspecified error occurred during the SSH session. Available as of cURL 7.16.1.
`CURLE_SSL_CACERT` (int)
`CURLE_SSL_CACERT_BADFILE` (int)	Problem with reading the SSL CA cert.
`CURLE_SSL_CERTPROBLEM` (int)	Problem with the local client certificate.
`CURLE_SSL_CIPHER` (int)	Could not use specified cipher.
`CURLE_SSL_CONNECT_ERROR` (int)	A problem occurred somewhere in the SSL/TLS handshake. Reading the message in the error buffer provides more details on the problem. Could be certificates (file formats, paths, permissions), passwords, and others.
`CURLE_SSL_ENGINE_NOTFOUND` (int)	The specified crypto engine was not found.
`CURLE_SSL_ENGINE_SETFAILED` (int)	Failed setting the selected SSL crypto engine as default.
`CURLE_SSL_PEER_CERTIFICATE` (int)
`CURLE_SSL_PINNEDPUBKEYNOTMATCH` (int)	Failed to match the pinned key specified with `CURLOPT_PINNEDPUBLICKEY`.
`CURLE_TELNET_OPTION_SYNTAX` (int)
`CURLE_TOO_MANY_REDIRECTS` (int)	Too many redirects. When following redirects, libcurl hit the maximum amount. The limit can be set with `CURLOPT_MAXREDIRS`.
`CURLE_UNKNOWN_TELNET_OPTION` (int)
`CURLE_UNSUPPORTED_PROTOCOL` (int)	The URL passed to libcurl used a protocol that libcurl does not support. The issue might be a compile-time option that was not used, a misspelled protocol string or just a protocol libcurl has no code for.
`CURLE_URL_MALFORMAT` (int)	The URL was not properly formatted.
`CURLE_URL_MALFORMAT_USER` (int)
`CURLE_WEIRD_SERVER_REPLY` (int)	The server sent data libcurl could not parse. This error code was known as `CURLE_FTP_WEIRD_SERVER_REPLY` before cURL 7.51.0. Available as of PHP 7.3.0 and cURL 7.51.0
`CURLE_WRITE_ERROR` (int)	An error occurred when writing received data to a local file, or an error was returned to libcurl from a write callback.

curl_multi_* status constants

Constants	Description
`CURLM_ADDED_ALREADY` (int)	An easy handle already added to a multi handle was attempted to get added a second time. Available as of cURL 7.32.1
`CURLM_BAD_EASY_HANDLE` (int)	An easy handle was not good/valid. It could mean that it is not an easy handle at all, or possibly that the handle already is in use by this or another multi handle.
`CURLM_BAD_HANDLE` (int)	The passed-in handle is not a valid multi handle.
`CURLM_CALL_MULTI_PERFORM` (int)	As of cURL 7.20.0, this constant is not used. Before cURL 7.20.0, this status could be returned by curl_multi_exec() when curl_multi_select() or a similar function was called before it returned any other constant.
`CURLM_INTERNAL_ERROR` (int)	Internal `libcurl` error.
`CURLM_OK` (int)	No errors.
`CURLM_OUT_OF_MEMORY` (int)	Ran out of memory while processing multi handles.

curl_pause()

Constants	Description
`CURLPAUSE_ALL` (int)	Pause sending and receiving data. Available as of cURL 7.18.0.
`CURLPAUSE_CONT` (int)	Unpause sending and receiving data. Available as of cURL 7.18.0.
`CURLPAUSE_RECV` (int)	Pause receiving data. Available as of cURL 7.18.0.
`CURLPAUSE_RECV_CONT` (int)	Unpause receiving data. Available as of cURL 7.18.0.
`CURLPAUSE_SEND` (int)	Pause sending data. Available as of cURL 7.18.0.
`CURLPAUSE_SEND_CONT` (int)	Unpause sending data. Available as of cURL 7.18.0.

Improve This Page

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 5 notes

down

nimasdj [AT] yahoo [DOT] com ¶

9 years ago

I hope this would be useful to convert error codes:

<?php
$curl_errno = array(
1  => "CURLE_UNSUPPORTED_PROTOCOL",
2  => "CURLE_FAILED_INIT",
3  => "CURLE_URL_MALFORMAT",
4  => "CURLE_URL_MALFORMAT_USER",
5  => "CURLE_COULDNT_RESOLVE_PROXY",
6  => "CURLE_COULDNT_RESOLVE_HOST",
7  => "CURLE_COULDNT_CONNECT",
8  => "CURLE_FTP_WEIRD_SERVER_REPLY",
9  => "CURLE_FTP_ACCESS_DENIED",
10 => "CURLE_FTP_USER_PASSWORD_INCORRECT",
11 => "CURLE_FTP_WEIRD_PASS_REPLY",
12 => "CURLE_FTP_WEIRD_USER_REPLY",
13 => "CURLE_FTP_WEIRD_PASV_REPLY",
14 => "CURLE_FTP_WEIRD_227_FORMAT",
15 => "CURLE_FTP_CANT_GET_HOST",
16 => "CURLE_FTP_CANT_RECONNECT",
17 => "CURLE_FTP_COULDNT_SET_BINARY",
18 => "CURLE_FTP_PARTIAL_FILE or CURLE_PARTIAL_FILE",
19 => "CURLE_FTP_COULDNT_RETR_FILE",
20 => "CURLE_FTP_WRITE_ERROR",
21 => "CURLE_FTP_QUOTE_ERROR",
22 => "CURLE_HTTP_NOT_FOUND or CURLE_HTTP_RETURNED_ERROR",
23 => "CURLE_WRITE_ERROR",
24 => "CURLE_MALFORMAT_USER",
25 => "CURLE_FTP_COULDNT_STOR_FILE",
26 => "CURLE_READ_ERROR",
27 => "CURLE_OUT_OF_MEMORY",
28 => "CURLE_OPERATION_TIMEDOUT or CURLE_OPERATION_TIMEOUTED",
29 => "CURLE_FTP_COULDNT_SET_ASCII",
30 => "CURLE_FTP_PORT_FAILED",
31 => "CURLE_FTP_COULDNT_USE_REST",
32 => "CURLE_FTP_COULDNT_GET_SIZE",
33 => "CURLE_HTTP_RANGE_ERROR",
34 => "CURLE_HTTP_POST_ERROR",
35 => "CURLE_SSL_CONNECT_ERROR",
36 => "CURLE_BAD_DOWNLOAD_RESUME or CURLE_FTP_BAD_DOWNLOAD_RESUME",
37 => "CURLE_FILE_COULDNT_READ_FILE",
38 => "CURLE_LDAP_CANNOT_BIND",
39 => "CURLE_LDAP_SEARCH_FAILED",
40 => "CURLE_LIBRARY_NOT_FOUND",
41 => "CURLE_FUNCTION_NOT_FOUND",
42 => "CURLE_ABORTED_BY_CALLBACK",
43 => "CURLE_BAD_FUNCTION_ARGUMENT",
44 => "CURLE_BAD_CALLING_ORDER",
45 => "CURLE_HTTP_PORT_FAILED",
46 => "CURLE_BAD_PASSWORD_ENTERED",
47 => "CURLE_TOO_MANY_REDIRECTS",
48 => "CURLE_UNKNOWN_TELNET_OPTION",
49 => "CURLE_TELNET_OPTION_SYNTAX",
50 => "CURLE_OBSOLETE",
51 => "CURLE_SSL_PEER_CERTIFICATE",
52 => "CURLE_GOT_NOTHING",
53 => "CURLE_SSL_ENGINE_NOTFOUND",
54 => "CURLE_SSL_ENGINE_SETFAILED",
55 => "CURLE_SEND_ERROR",
56 => "CURLE_RECV_ERROR",
57 => "CURLE_SHARE_IN_USE",
58 => "CURLE_SSL_CERTPROBLEM",
59 => "CURLE_SSL_CIPHER",
60 => "CURLE_SSL_CACERT",
61 => "CURLE_BAD_CONTENT_ENCODING",
62 => "CURLE_LDAP_INVALID_URL",
63 => "CURLE_FILESIZE_EXCEEDED",
64 => "CURLE_FTP_SSL_FAILED",
79 => "CURLE_SSH"
);
?>

down

uramihsayibok, gmail, com ¶

8 years ago

Regarding CURLE_OPERATION_TIMEDOUT vs. CURLE_OPERATION_TIMEOUTED:

Originally cURL had the constant named TIMEOUTED (read: "timeout-ed"). This was changed[1] in 2007 and v7.17.0 to be TIMEDOUT (read: "timed out") and the old constant kept in place as an alias.

PHP started off using TIMEOUTED as well. The TIMEDOUT constant was added[2] in 2012 and v5.5.0 and the old constant was *kept in place*.

If you ask me, the TIMEDOUT constant reads more nicely (not to mention is technically the correct one to use) and as long as you're using PHP 5.5+ then it is available. If you have to support older versions then I suggest you keep using the new constant and add a polyfill like

<?php
if (version_compare(PHP_VERSION, "5.5.0", "<")) {
define("CURLE_OPERATION_TIMEDOUT", CURLE_OPERATION_TIMEOUTED);
}
?>

or

<?php
// PHP <5.5.0
defined("CURLE_OPERATION_TIMEDOUT") || define("CURLE_OPERATION_TIMEDOUT", CURLE_OPERATION_TIMEOUTED);
?>

to be removed once you stop supporting them.

[1] https://github.com/bagder/curl/commit/9f44a95522162c0f4a61093efe1bf1f58b087358#diff-d8c6cb80505e0f7d5e27fca2a682aa34L119
[2] https://github.com/php/php-src/commit/9ab45d3edbafa3ee751472c3f8d1fb3f51f38cf1#diff-ac978e3de205f1d14eb960e0eb15ef24R723

down

s dot coletta at unidata dot it ¶

14 years ago

Beware of CURLE_* constants!

On the official site:

http://curl.haxx.se/libcurl/c/libcurl-errors.html

some constants are different, some missing compared to the PHP implementation.

Some examples:

in PHP the curl error number 28 is called

CURLE_OPERATION_TIMEOUTED

while in the official site is:

CURLE_OPERATION_TIMEDOUT

So if you use the second, it won't march the error 28 because in PHP it is not defined that way.

The same is for these:

CURLE_HTTP_RETURNED_ERROR
CURLE_UPLOAD_FAILED
CURLE_INTERFACE_FAILED
CURLE_SSL_CERTPROBLEM
CURLE_SEND_FAIL_REWIND
CURLE_LOGIN_DENIED
CURLE_AGAIN

that are in someway named differently or missing from PHP.

down

Ron ¶

17 years ago

<?

/*

* Author: Ron

* Released: August 4, 2007

* Description: An example of the disguise_curl() function in order to grab contents from a website while remaining fully camouflaged by using a fake user agent and fake headers.

*/


$url = 'http://www.ericgiguere.com/tools/http-header-viewer.html';


// disguises the curl using fake headers and a fake user agent.

function disguise_curl($url)

{

  $curl = curl_init();


  // Setup headers - I used the same headers from Firefox version 2.0.0.6

  // below was split up because php.net said the line was too long. :/

  $header[0] = "Accept: text/xml,application/xml,application/xhtml+xml,";

  $header[0] .= "text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";

  $header[] = "Cache-Control: max-age=0";

  $header[] = "Connection: keep-alive";

  $header[] = "Keep-Alive: 300";

  $header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";

  $header[] = "Accept-Language: en-us,en;q=0.5";

  $header[] = "Pragma: "; // browsers keep this blank.


  curl_setopt($curl, CURLOPT_URL, $url);

  curl_setopt($curl, CURLOPT_USERAGENT, 'Googlebot/2.1 (+http://www.google.com/bot.html)');

  curl_setopt($curl, CURLOPT_HTTPHEADER, $header);

  curl_setopt($curl, CURLOPT_REFERER, 'http://www.google.com');

  curl_setopt($curl, CURLOPT_ENCODING, 'gzip,deflate');

  curl_setopt($curl, CURLOPT_AUTOREFERER, true);

  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

  curl_setopt($curl, CURLOPT_TIMEOUT, 10);


  $html = curl_exec($curl); // execute the curl command

  curl_close($curl); // close the connection


  return $html; // and finally, return $html

}


// uses the function and displays the text off the website

$text = disguise_curl($url);

echo $text;

?>


~Ron

down

jrschlosser ¶

6 years ago

In PHP version 7.1.11 there is also constants for HTTP/2 :
CURL_VERSION_HTTP2 = 65536 (1 << 16)
CURL_HTTP_VERSION_2_0 = 3

I don't know the first version of PHP that defines it.

＋add a note