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run code in 150+ php & hhvm versions
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<?php $a = array(1,2,3,4,5,2,3); $b = array(3,5); var_dump(array_diff($a, $b));
Output for 4.3.0 - 7.1.0
array(4) { [0]=> int(1) [1]=> int(2) [3]=> int(4) [5]=> int(2) }