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<?php $array = array(); $array[] = array('441', '442', '443'); $array[] = array('441', '443'); $array[] = array('441', '442',); $array[] = array(); $array = array_filter($array); $res_arr = array_shift($array); foreach($array as $filter){ $res_arr = array_intersect($res_arr, $filter); } print_r($res_arr);
Output for rfc.property-hooks, git.master, git.master_jit
Array ( [0] => 441 )

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