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<?php $a = array_combine(range(1, 10), range(1, 10)); $b = [5,6,1,2,4,7]; print_r(array_diff($a, $b));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [3] => 3 [8] => 8 [9] => 9 [10] => 10 )

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