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<?php $array = array( 0 => array(1, 2, 3, 4), 1 => array(1, 3, 2, 4), 2 => array(1, 2, 4, 3), 3 => array(1, 2, 5, 6) ); $filter = array(); $result = array_filter($array, function($e) use (&$filter) { $sum = array_sum($e); $ret = isset($filter[$sum]); $filter[$sum] = true; return !$ret; }); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) } [3]=> array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(5) [3]=> int(6) } }

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