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run code in 200+ php & hhvm versions
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<?php $x = array_diff(array("100", "101", "102"), array("101")); var_dump(implode(",", $x));
based on otZcQ
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
string(7) "100,102"