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<?php $a = [0, 1, 2, 3, 4, 5, 6]; $b = [4]; print_r(array_udiff($a, $b, function($x, $y) { return $x <=> $y; })); print_r(array_udiff($a, $b, function($x, $y) { return $x == $y ? 0 : -1; }));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [5] => 5 [6] => 6 ) Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [5] => 5 [6] => 6 )

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