[PHP知识库]php二维数组按照某个字段合并重复的，其他字段相同的保留一个，不同的组成新数组，字段名不变

$param =  array(
            array (
                'hykno'         => '8B6D',
                'mount'   => '12',
                'protypeid'     => '1',
            ),
            array (
                'hykno'         => 'CB',
                'mount'   => '56',           
                'protypeid'     => '3',
            ),
            array (
                'hykno'         => '8B6D',
                'mount'   => '34',           
                'protypeid'     => '1',
            ),
            array (
                'hykno'         => 'CB',
                'mount'   => '78',           
                'protypeid'     => '3',
            ),
            array (
                'hykno'         => 'CcB',
                'mount'   => '178',           
                'protypeid'     => '4',
            )
        );

        $u = array();
        foreach ($param as $k => $v){
            if (!in_array($v['protypeid'],$u)){
                $u[] = $v['protypeid'];
            }
        }

        $data = array();
        foreach ($u as $uk => $uv)
        {
            foreach ($param as $pk => $pv)
            {
                if ($pv['protypeid'] == $uv)
                {
                    $data[$uv]['hykno'] = $pv['hykno'];
                    $data[$uv]['mount'] []= $pv['mount'];
                }
            }
        }

        $data = array_values($data);

        print_r($data);

结果是：

Array
(
    [0] => Array
        (
            [hykno] => 8B6D
            [mount] => Array
                (
                    [0] => 12
                    [1] => 34
                )

        )

    [1] => Array
        (
            [hykno] => CB
            [mount] => Array
                (
                    [0] => 56
                    [1] => 78
                )

        )

    [2] => Array
        (
            [hykno] => CcB
            [mount] => Array
                (
                    [0] => 178
                )

        )

)