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run code in 200+ php & hhvm versions
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<?php var_dump(array_diff(array('1' => 3, '2' => 4), array('3')));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
array(1) { [2]=> int(4) }