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<?php $array1 = range(1,12); $array2 = ['1','2','3','5','6','7','8','9','10','11','12']; var_dump(array_values(array_diff($array1, $array2)));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> int(4) }

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