php小代码求二维数据的差集

 $val){    if(isset($D[$key])&&$D[$key]==1){            }else{        $A_B[] = explode('#', $key);    }}var_dump($A_B);echo '
';/* * 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);