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run code in 200+ php & hhvm versions
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<?php $array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5); var_dump(array_filter($array1));
based on 89TPZ
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(5) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) ["d"]=> int(4) ["e"]=> int(5) }