php 两个二维数组重组新数组，数组下标不同

Array
(
    [0] => Array
        (
            [PosNum] => 27025008
            [start_time] => 20180328164929
            [type] => 0
        )

    [1] => Array
        (
            [PosNum] => 27065075
            [start_time] => 20180328164939
            [type] => 1
        )

    [2] => Array
        (
            [PosNum] => 27065684
            [start_time] => 20180329164918
            [type] => 2
        )

    [3] => Array
        (
            [PosNum] => 27065099
            [start_time] => 20180329165556
            [type] => 3
        )

)

Array
(
    [5] => Array
        (
            [StudentNumber] => 20116161
            [PosNum] => 27025008
            [judgmenttime] => 20180328164929
            [type] => 0
        )

    [0] => Array
        (
            [StudentNumber] => 3333号
            [PosNum] => 27065075
            [judgmenttime] => 20180328164939
            [type] => 1
        )

    [4] => Array
        (
            [StudentNumber] => 123654789
            [PosNum] => 27065684
            [judgmenttime] => 20180329164918
            [type] => 2
        )

    [2] => Array
        (
            [StudentNumber] => 232222222
            [PosNum] => 27065099
            [judgmenttime] => 20180329165556
            [type] => 3
        )

    [1] => Array
        (
            [StudentNumber] => 11111111
            [PosNum] => 27065188
            [judgmenttime] => 20180328165123
            [type] => 0
        )

    [3] => Array
        (
            [StudentNumber] => 3333333
            [PosNum] => 27065066
            [judgmenttime] => 20180328162058
            [type] => 4
        )

)

  //重组数组
        $arr1 = array();
        foreach ($res as $k => $v) {
            //多的数组
            foreach ($result as $ke => $va) {
                //少的数组为主
                if ($v['PosNum'] == $va['PosNum']) {
                    $arr1[$ke]['StudentNumber'] = $va['StudentNumber'];
                    $arr1[$ke]['PosNum']        = $va['PosNum'];
                    $arr1[$ke]['judgmenttime']  = $v['start_time'];
                   // $arr1[$ke][$type[$v['type']]] = $v['start_time'];
                    $arr1[$ke]['type'] =$v['type'];
                }
            }
        }