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<?php $a = array('one', 'two'); $b = array('two'); $c = array_diff($a, $b); $c[] = 'three'; var_dump($c);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> string(3) "one" [1]=> string(5) "three" }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
array(2) { [0]=> string(3) "one" [2]=> string(5) "three" }

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231.03 ms | 402 KiB | 330 Q