php如何操作這樣的陣列

Question

<?php
//////当前查询出来的数据
$redata = array(
    0=>['id'=>1,'name'=>'张三','age'=>22,'hobby'=>'学习'],
    1=>['id'=>1,'name'=>'张三','age'=>22,'hobby'=>'骑行'],
    2=>['id'=>2,'name'=>'李四','age'=>20,'hobby'=>'旅游'],
);

//如何才能转换成下面这种形式的？  写了一上午 愣是没写出来
$arr = array(
    0=>[
        'id'=>1,'name'=>'张三','age'=>22,'hobby'=> ['学习', '骑行']
    ],
    1=>[
        'id'=>2,'name'=>'李四','age'=>20,'hobby'=> ['旅游']
    ]
);

#

Answer 1

$r = array(
            0=>['id'=>1,'name'=>'张三','age'=>22,'hobby'=>'学习'],
            1=>['id'=>1,'name'=>'张三','age'=>22,'hobby'=>'骑行'],
            2=>['id'=>2,'name'=>'李四','age'=>20,'hobby'=>'旅游'],
        );
        $dd = [];
        foreach ($r as $k => $vv) {
            $dd[$vv['id']]['id'] = $vv['id'];
            $dd[$vv['id']]['age'] = $vv['age'];
            $dd[$vv['id']]['hobby'][] = $vv['hobby'];
            
        }
        P($dd);
        Array
(
    [1] => Array
        (
            [id] => 1
            [age] => 22
            [hobby] => Array
                (
                    [0] => 学习
                    [1] => 骑行
                )

        )

    [2] => Array
        (
            [id] => 2
            [age] => 20
            [hobby] => Array
                (
                    [0] => 旅游
                )

        )

)

#

Answer 2

        $dd = [];
        foreach ($r as $k => $vv) {
            $dd[$vv['id']]['id'] = $vv['id'];
            $dd[$vv['id']]['age'] = $vv['age'];
            $dd[$vv['id']]['hobby'][] = $vv['hobby'];
            
        }

這樣