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run code in 150+ php & hhvm versions
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<?php $a = 'foo'; $array = [&$a]; var_dump($array); $newArray = array_map(function($item){ return &$item; }, $array); var_dump($newArray);
Output for 5.4.0 - 5.4.25
Parse error: syntax error, unexpected '&' in /in/53olq on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected '[' in /in/53olq on line 4
Process exited with code 255.