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run code in 150+ php & hhvm versions
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<?php var_dump(array_diff(array('x' => 'x', 'z' => 'z'), array('x' => 'y')));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["x"]=> string(1) "x" ["z"]=> string(1) "z" }