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<?php $relate_to = array(11,22); $before = ''; $relate_to_before = explode(',', $before); sort($relate_to_before); $relate_to_new = array_diff($relate_to, $relate_to_before); var_dump($relate_to_new);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> int(11) [1]=> int(22) }

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