我试图在关联数组中用 2 个键条件对值求和，但没有得到任何结果，只是不像预期的那样。
我的阵列：
Array
(
[0] => Array
(
[pid] => P1
[rid] => 1
[price] => 100
)
[1] => Array
(
[pid] => P1
[rid] => 1
[price] => 120
)
[2] => Array
(
[pid] => P1
[rid] => 1
[price] => 130
)
[3] => Array
(
[pid] => P2
[rid] => 1
[price] => 80
)
[4] => Array
(
[pid] => P2
[rid] => 1
[price] => 120
)
[5] => Array
(
[pid] => P2
[rid] => 2
[price] => 150
)
);
我已经尝试了How to GROUP BY 和 SUM PHP Array 中的一些代码 ？或在 PHP 中对数组进行分组
然后代码变成：
$groups = array();
foreach ($array as $item) {
$key = $item['pid'];
if (!array_key_exists($key,$groups)) {
$groups[$key] = array(
'pid' => $item['pid'],
'rid'=>$item['rid'],
'price' => $item['price']
);
} else {
$groups[$key]['price'] += $item['price'];
}
}
我期望输出数组：
Array
(
[0] => Array
(
[pid] => P1
[rid] => 1
[price] => 350
)
[1] => Array
(
[pid] => P2
[rid] => 1
[price] => 200
)
[2] => Array
(
[pid] => P2
[rid] => 2
[price] => 150
)
);
我不知道如何用 array_reduce 和 foreach 来解决这个问题，请用其他参考打我或帮我解决这个问题。
倚天杖