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<?php $a = array('red', 'green', 'blue'); $b = array('red', 'green', 'purple'); var_dump(array_diff($a,$b));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [2]=> string(4) "blue" }