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run code in 300+ PHP versions simultaneously

@ 2013-11-13T00:14:56Z

<?php
function remove_recursion($o){
    static  $replace;
    if(!isset($replace))
        $replace = create_function('$m','$r="\x00{$m[1]}ecursion_";return \'s:\'.strlen($r.$m[2]).\':"\'.$r.$m[2].\'";\';')
    ;
    if(is_array($o) || is_object($o)){
        $re = '#(r|R):([0-9]+);#';
        $serialize = serialize($o);
        if(preg_match($re, $serialize)){
            $last = $pos = 0;
            while(false !== ($pos = strpos($serialize, 's:', $pos))){
                $chunk = substr($serialize, $last, $pos - $last);
                if(preg_match($re, $chunk)){
                    $length = strlen($chunk);
                    $chunk = preg_replace_callback($re, $replace, $chunk);
                    $serialize = substr($serialize, 0, $last).$chunk.substr($serialize, $last + ($pos - $last));
                    $pos += strlen($chunk) - $length;
                }
                $pos += 2;
                $last = strpos($serialize, ':', $pos);
                $length = substr($serialize, $pos, $last- $pos);
                $last += 4 + $length;
                $pos = $last;
            }
            $serialize = substr($serialize, 0, $last).preg_replace_callback($re, $replace, substr($serialize, $last));
            $o = unserialize($serialize);
        }
    }
    return $o;
}

$o = new stdClass;
$o->n = function($a) { return $a; };
$o->r = &$o;

echo serialize($o), '
',
     serialize(
        remove_recursion($o)
     )
;

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught Exception: Serialization of 'Closure' is not allowed in /in/lOjLg:37 Stack trace: #0 /in/lOjLg(37): serialize(Object(stdClass)) #1 {main} thrown in /in/lOjLg on line 37
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38: Fatal error: Uncaught exception 'Exception' with message 'Serialization of 'Closure' is not allowed' in /in/lOjLg:37 Stack trace: #0 /in/lOjLg(37): serialize(Object(stdClass)) #1 {main} thrown in /in/lOjLg on line 37
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/lOjLg on line 34
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION in /in/lOjLg on line 34
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/lOjLg on line 34
Process exited with code 255.

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