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<?php $ids=array("a","b","c","d","e"); $groups=array(array("a","c"),array("c","e")); array_walk($groups,function($v,$i)use(&$ids){ $ids=array_diff($ids,$v); }); print_r($ids);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [1] => b [3] => d )

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