php使用多维数组按SUM分组

Question

我有一个这样的PHP数组：

 Array
    (
        [0] => Array
            (
                [url_id] => 2191238
                [time_spent] => 41

            )

        [1] => Array
            (
                [url_id] => 2191606
                [time_spent] => 215

            )
        [2] => Array
            (
                [url_id] => 2191606
                [time_spent] => 25

            )
    )

因此，如何time_spent通过url_id 获取基于组的SUM（使用array_count_values）

Answer 1

为什么不更简单

$ts_by_url = array();
foreach($array as $data) {
    $ts_by_url[ $data['url_id'] ] += $data['time_spent'];
}