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