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run code in 150+ php & hhvm versions
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<?php $arr = array(1,2,3,4,5); array_walk(array(1,2,3,4,5), function($value, $key){ echo "%". $value ."% "; });
Output for 5.3.0 - 5.4.21
Fatal error: Only variables can be passed by reference in /in/s1L61 on line 3
Process exited with code 255.