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run code in 150+ php & hhvm versions
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<?php $array_1 = array('something1', 'foo'); $array_2 = array('something3', 'bar'); $array_3 = array(); $array_4 = array('something1', 'foobar'); array_walk(array($array_1,$array_2,$array_3,$array_4),function(&$value, $key){ });
Output for 5.3.0 - 5.4.22
Fatal error: Only variables can be passed by reference in /in/6691c on line 7
Process exited with code 255.