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<?php function subtract($a, $b) { $a2 = []; $lookup = array_count_values($b); foreach ($a as $v) { if ($lookup[$v] ?? 0) { $lookup[$v]--; } else { $a2[] = $v; } } return $a2; } var_dump(subtract( ['a', 'a', 'b', 'c', 'd', 'd', 'd', 'd'], ['a', 'b', 'd', 'd'] ));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(1) "a" [1]=> string(1) "c" [2]=> string(1) "d" [3]=> string(1) "d" }

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