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run code in 150+ php & hhvm versions
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<?php $arr = array(11, '11', 'd1'); var_dump(array_filter($arr, 'ctype_digit')); var_dump(array_filter($arr, 'is_numeric'));
based on UZjoc
Output for 4.3.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> string(2) "11" } array(2) { [0]=> int(11) [1]=> string(2) "11" }
Output for hhvm-3.10.0

Process exited with code 153.