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run code in 200+ php & hhvm versions
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<?php var_dump(array_diff(array("100", "101", "102"), array("101")));
based on 3jHdS
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(2) { [0]=> string(3) "100" [2]=> string(3) "102" }