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@ 2016-07-20T04:00:50Z

<?php

function foo(&$a, $b) {
    $a = 'modified';
    $b = 'modified';
}

class C {
    function foo(&$a, $b) {
        $a = 'modified';
        $b = 'modified';
    }
}

class S {
    static function foo(&$a, $b) {
        $a = 'modified';
        $b = 'modified';
    }
}

$vv["'foo'"] = 'foo';
$vv["['S', 'foo']"] = ['S', 'foo'];
$vv["[new C, 'foo']"] = [new C, 'foo'];
$vv["function(..){..}"] = function(&$a, $b) {
    $a = 'modified';
    $b = 'modified';
};
$vv["'S::foo'"] = 'S::foo';

foreach ($vv as $label => $v) {
    print $label;
    print is_callable($v) ? 'is callable' : 'is not callable';
    print "\n";

    $a = 'orig';
    $b = 'orig';
    call_user_func_array($v, array(&$a, &$b));
    assert($a === 'modified');
    assert($b === 'orig');

    $a = 'orig';
    $b = 'orig';
    $v($a, $b);
    assert($a === 'modified');
    assert($b === 'orig');
}

Output for git.master, git.master_jit, rfc.property-hooks: 'foo'is callable ['S', 'foo']is callable [new C, 'foo']is callable function(..){..}is callable 'S::foo'is callable

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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