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run code in 200+ php & hhvm versions
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<?php $a=array(2,1,3,4); $b=array(1,2,3,4); var_dump(array_diff_assoc($a, $b));
Output for 4.3.0 - 7.2.0
array(2) { [0]=> int(2) [1]=> int(1) }