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@ 2013-12-13T01:43:27Z

<?php
call_user_func(function(){
    echo 'val_val' . PHP_EOL;

    $a = "xxx";
    $b = $a;
    $c = $b;

    ob_start(function ($s) { return preg_replace('/^/m', "  ", $s); });
    xdebug_debug_zval('a', 'b', 'c');
    ob_end_flush();
});

call_user_func(function(){
    echo 'ref_val' . PHP_EOL;

    $a = "xxx";
    $b = &$a;
    $c = $b;

    ob_start(function ($s) { return preg_replace('/^/m', "  ", $s); });
    xdebug_debug_zval('a', 'b', 'c');
    ob_end_flush();
});

call_user_func(function(){
    echo 'val_ref' . PHP_EOL;

    $a = "xxx";
    $b = $a;
    $c = &$b;

    ob_start(function ($s) { return preg_replace('/^/m', "  ", $s); });
    xdebug_debug_zval('a', 'b', 'c');
    ob_end_flush();
});

call_user_func(function(){
    echo 'ref_ref' . PHP_EOL;

    $a = "xxx";
    $b = &$a;
    $c = &$b;

    ob_start(function ($s) { return preg_replace('/^/m', "  ", $s); });
    xdebug_debug_zval('a', 'b', 'c');
    ob_end_flush();
});

Output for git.master, git.master_jit, rfc.property-hooks: val_val Fatal error: Uncaught Error: Call to undefined function xdebug_debug_zval() in /in/ntMhs:10 Stack trace: #0 /in/ntMhs(12): {closure}() #1 {main} thrown in /in/ntMhs on line 10
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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