curl_multi_init

    (PHP 5, PHP 7, PHP 8)

    curl_multi_init — Returns a new cURL multi handle

    Description

    curl_multi_init(): CurlMultiHandle

    Allows the processing of multiple cURL handles asynchronously.

    Parameters

    This function has no parameters.

    Return Values

    Returns a cURL multi handle.

    Changelog

    Version Description
    8.0.0 On success, this function returns a CurlMultiHandle instance now; previously, a resource was returned.

    Examples

    Example #1 curl_multi_init() example

    This example will create two cURL handles, add them to a multi handle, and process them asynchronously.

    <?php
    // create both cURL resources
    $ch1 = curl_init();
    $ch2 = curl_init();

    // set URL and other appropriate options
    curl_setopt($ch1, CURLOPT_URL, "http://lxr.php.net/");
    curl_setopt($ch1, CURLOPT_HEADER, 0);
    curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");
    curl_setopt($ch2, CURLOPT_HEADER, 0);

    //create the multiple cURL handle
    $mh = curl_multi_init();

    //add the two handles
    curl_multi_add_handle($mh,$ch1);
    curl_multi_add_handle($mh,$ch2);

    //execute the multi handle
    do {
    $status = curl_multi_exec($mh, $active);
    if (    $active) {
    curl_multi_select($mh);
    }
    } while (    $active && $status == CURLM_OK);

    //close the handles
    curl_multi_remove_handle($mh, $ch1);
    curl_multi_remove_handle($mh, $ch2);
    curl_multi_close($mh);

    ?>

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    User Contributed Notes 3 notes

    up
    55
    w_haigh at yahoo dot com
    8 years ago
    Here's an easier to follow example, From : http://arguments.callee.info/2010/02/21/multiple-curl-requests-with-php/

    // build the individual requests, but do not execute them
    $ch_1 = curl_init('http://webservice.one.com/');
    $ch_2 = curl_init('http://webservice.two.com/');
    curl_setopt($ch_1, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch_2, CURLOPT_RETURNTRANSFER, true);

    // build the multi-curl handle, adding both $ch
    $mh = curl_multi_init();
    curl_multi_add_handle($mh, $ch_1);
    curl_multi_add_handle($mh, $ch_2);

    // execute all queries simultaneously, and continue when all are complete
    $running = null;
    do {
    curl_multi_exec($mh, $running);
    } while ($running);

    //close the handles
    curl_multi_remove_handle($mh, $ch1);
    curl_multi_remove_handle($mh, $ch2);
    curl_multi_close($mh);

    // all of our requests are done, we can now access the results
    $response_1 = curl_multi_getcontent($ch_1);
    $response_2 = curl_multi_getcontent($ch_2);
    echo "$response_1 $response_2"; // output results
    up
    45
    xxavalanchexx at gmail dot com
    10 years ago
    According to https://bugs.php.net/bug.php?id=61141:

    On Windows setups using libcurl version 7.24 or later (which seems to correspond to PHP 5.3.10 or later), you may find that curl_multi_select() always returns -1, causing the example code in the documentation to timeout. This is, apparently, not strictly a bug: according to the libcurl documentation, you should add your own sleep if curl_multi_select returns -1.

    Therefore, in order to work correctly on Windows for PHP 5.3.10+, the second loop in the example code should look something like the following:

    <?php
    while ($active && $mrc == CURLM_OK) {
    if (    curl_multi_select($mh) == -1) {
    usleep(100);
    }
    do {
    $mrc = curl_multi_exec($mh, $active);
    } while (    $mrc == CURLM_CALL_MULTI_PERFORM);
    }
    ?>
    up
    5
    Adam Richardson
    6 years ago
    One of the URLs used in the first example on this page (lxr.php.net) now gives a proxy error.

    If you're using this first script example, replace with a different URL.
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