php数组处置

php数组处理
array(4) {
[0] => array(3) {
["Id"] => string(2) "24"
["FromMid"] => string(3) "157"
["ToMid"] => string(3) "157"
}
[1] => array(3) {
["Id"] => string(2) "22"
["FromMid"] => string(3) "157"
["ToMid"] => string(3) "176"
}
[2] => array(3) {
["Id"] => string(1) "4"
["FromMid"] => string(3) "157"
["ToMid"] => string(2) "25"
}
[3] => array(3) {
["Id"] => string(1) "1"
["FromMid"] => string(2) "25"
["ToMid"] => string(3) "157"
}
}

我想把["FromMid"]==["ToMid"]&&["ToMid"]==["FromMid"]处理掉 只留一条
得出的结果应该是
array(4) {
[0] => array(3) {
["Id"] => string(2) "24"
["FromMid"] => string(3) "157"
["ToMid"] => string(3) "157"
}
[1] => array(3) {
["Id"] => string(2) "22"
["FromMid"] => string(3) "157"
["ToMid"] => string(3) "176"
}
[2] => array(3) {
["Id"] => string(1) "4"
["FromMid"] => string(3) "157"
["ToMid"] => string(2) "25"
}
}

------解决方案--------------------

PHP code

------解决方案--------------------

PHP code

$data = array(
    array("Id" => "24", "FromMid" => "157", "ToMid" => "157"),
    array("Id" => "22", "FromMid" => "157", "ToMid" => "176"),
    array("Id" => "4", "FromMid" => "157", "ToMid" => "25"),
    array("Id" => "1", "FromMid" => "25", "ToMid" => "157")
);

$markList = array();
foreach ($data as $key => $val) {
    $posi = md5($val['FromMid'] . $val['ToMid']);
    $anti = md5($val['ToMid'] . $val['FromMid']);
    if (isset($markList[$posi]) || isset($markList[$anti])) {
        unset($data[$key]);
    } else {
        $markList[$posi] = $markList[$anti] = 1;
    }
}
echo '
';print_r($data);

/**
输出：
Array
(
    [0] => Array
        (
            [Id] => 24
            [FromMid] => 157
            [ToMid] => 157
        )

    [1] => Array
        (
            [Id] => 22
            [FromMid] => 157
            [ToMid] => 176
        )

    [2] => Array
        (
            [Id] => 4
            [FromMid] => 157
            [ToMid] => 25
        )
*/