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run code in 150+ php & hhvm versions
Bugs & Features
<?php $array = array("1","2","3"); $only_integers === array_filter($array,'is_numeric'); // true var_dump($only_integers);
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: only_integers in /in/jqrYE on line 3 Notice: Undefined variable: only_integers in /in/jqrYE on line 5 NULL
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: only_integers in /in/jqrYE on line 3 Notice: Undefined variable: only_integers in /in/jqrYE on line 5 NULL