数组重组求助~~

Question

下面这堆数组wid和gid相同的，要求Num累加，不同的不操作直接显示，数组去重如何实现？

$arr = array(
                array(
                        'wid' => 1,
                        'gid' => 3,
                        'num' => 4,
                    ),
                array(
                        'wid' => 2,
                        'gid' => 1,
                        'num' => 4,
                    ),
                array(
                        'wid' => 1,
                        'gid' => 3,
                        'num' => 3,
                    ),
                array(
                        'wid' => 2,
                        'gid' => 1,
                        'num' => 4,
                    ),
                 array(
                        'wid' => 1,
                        'gid' => 1,
                        'num' => 4,
                    ),
         );

下面是我想要的效果

$arr = array(
                array(
                        'wid' => 1,
                        'gid' => 3,
                        'num' => 7,
                    ),
                array(
                        'wid' => 2,
                        'gid' => 1,
                        'num' => 8,
                    ),
                 array(
                        'wid' => 1,
                        'gid' => 1,
                        'num' => 4,
                    ),
         );

Answer 1

没明白你想要什么效果

Answer 2

随便写了个，有更好的可以补充

$temp = $data = [];
foreach($arr as $v){
    if(isset($temp[$v['wid']][$v['gid']])){
        $temp[$v['wid']][$v['gid']] += $v['num'];
    }else{
        $temp[$v['wid']][$v['gid']] = $v['num'];
    }
}
foreach($temp as $k=>$v){
    foreach($v as $key=>$val){
        $data[] = [
            'wid' => $k,
            'gid' => $key,
            'num' => $val
        ];
    }
}
var_dump($data);