php小代码求二维数据的差集

<?php$A = array(array(1,2),array(2,4),array(3,2));$B = array(array(3,1),array(1,2));$C = array();foreach($A as $a){   $Ck = $a[0].'#'.$a[1];   $C[$Ck] = 1;}$D = array();foreach($B as $b){    $Dk = $b[0].'#'.$b[1];    $D[$Dk] = 1;}/* * A - B */$A_B = array();foreach($C as $key => $val){    if(isset($D[$key])&&$D[$key]==1){            }else{        $A_B[] = explode('#', $key);    }}var_dump($A_B);echo '<br/>';/* * B-A */$B_A = array();foreach($D as $key=>$val){    if(isset($C[$key])&&$C[$key]==1){            }else{        $B_A[] = explode('#', $key);    }}var_dump($B_A);