3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = array('a'=>1, 'b'=>2); $z = array_walk($x, function($item, $key){ return $item * 2; }) var_dump($x,$z);
Output for 5.4.0 - 5.4.30
Parse error: syntax error, unexpected 'var_dump' (T_STRING) in /in/U28Lc on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_STRING in /in/U28Lc on line 4
Process exited with code 255.
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197.11 ms | 1395 KiB | 67 Q