3v4l.org

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<?php $a = ['a','b','c','d','e','f']; $b = ['a','e']; $dic = array_flip($b); $result = array_filter($a, function($v)use($dic){return !isset($dic[$v]);}); print_r($result);
Output for 7.1.25 - 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Array ( [1] => b [2] => c [3] => d [5] => f )

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158.29 ms | 407 KiB | 5 Q