A new type, object, has been introduced that can be used for (contravariant) parameter typing and (covariant) return typing of any objects.
<?php
function test(object $obj) : object
{
return new SplQueue();
}
test(new stdClass());
Shared extensions no longer require their file extension
(.so for Unix or .dll for Windows) to
be specified. This is enabled in the php.ini file, as well as in the
dl() function.
Abstract methods can now be overridden when an abstract class extends another abstract class.
<?php
abstract class A
{
abstract function test(string $s);
}
abstract class B extends A
{
// overridden - still maintaining contravariance for parameters and covariance for return
abstract function test($s) : int;
}The modern Sodium cryptography library has now become a core extension in PHP.
For a complete function reference, see the Sodium chapter.
Argon2 has been added to the password hashing API, where the following constants have been exposed:
PDO's string type has been extended to support the national character type when emulating prepares. This has been done with the following constants:
These constants are utilised by bitwise OR'ing them with
PDO::PARAM_STR:
<?php
$db->quote('über', PDO::PARAM_STR | PDO::PARAM_STR_NATL);The PDOStatement::debugDumpParams() method has been updated to include the SQL being sent to the DB, where the full, raw query (including the replaced placeholders with their bounded values) will be shown. This has been added to aid with debugging emulated prepares (and so it will only be available when emulated prepares are turned on).
Support for EXOP has been added to the LDAP extension. This has been done by exposing the following functions and constants:
The sockets extension now has the ability to lookup address information, as well as connect to it, bind to it, and explain it. The following four functions have been added for this:
Parameter types from overridden methods and from interface implementations may now be omitted. This is still in compliance with LSP, since parameters types are contravariant.
<?php
interface A
{
public function Test(array $input);
}
class B implements A
{
public function Test($input){} // type omitted for $input
}A trailing comma can now be added to the group-use syntax introduced in PHP 7.0.
<?php
use Foo\Bar\{
Foo,
Bar,
Baz,
};The proc_nice() function is now supported on Windows.
The pack() and unpack() functions now support float and double in both little and big endian.
The EXIF extension has been updated to support a much larger range of formats. This means that their format specific tags are now properly translated when parsing images with the exif_read_data() function. The following new formats are now supported:
The EXIF functions exif_read_data() and exif_thumbnail() now support passing streams as their first argument.
J modifier for setting PCRE_DUPNAMES has been added.
SQLite3::openBlob() now allows to open BLOB fields in write mode; formerly only read mode was supported.
Support for Oracle Database Transparent Application Failover (TAF) callbacks has been added. TAF allows PHP OCI8 applications to automatically reconnect to a preconfigured database when a connection is broken. The new TAF callback support allows PHP applications to monitor and control reconnection during failover.
Read and write support for encrypted archives has been added (requires libzip 1.2.0).
The ZipArchive class now implements the Countable interface.
The zip:// stream now accepts a 'password' context option.
Note: "omitted" = "removed":
<?php
declare(strict_types=1);
interface ITest
{
public function run(array $input);
}
class Test implements ITest
{
public function run($input) {
return $input;
}
}
echo (new Test())->run('foo'); // display foo, no error
?>Note: you cant change parameter type for abstract method defined in interface.
<?php
abstract class AbstractAssocArray imlements ArrayAccess
{
abstract public function offsetSet($offset, $value): void;
...
}
abstract class AbstractAssocArray2 extends AbstractAssocArray
{
abstract public function offsetSet(string $offset, $value): void;
}
class AssocArray extends AbstractAssocArray2
{
public function offsetSet(string $offset, $value): void
{
$this->{$offset} = $value;
}
}
?>
It's throw fatal error: Declaration of AbstractAssocArray::offsetSet(string $offset, $value): void must be compatible with AbstractAssocArrayAccess::offsetSet($offset, $value).