按子数组值对数组进行分组 [英] Group array by subarray values

问题描述

我有以下格式的子数组数组:

I have an array of subarrays in the following format:

array
(
    a => array ( id = 20, name = chimpanzee )
    b => array ( id = 40, name = meeting )
    c => array ( id = 20, name = dynasty )
    d => array ( id = 50, name = chocolate )
    e => array ( id = 10, name = bananas )
    f => array ( id = 50, name = fantasy )
    g => array ( id = 50, name = football )
)

我想根据每个子数组中的 id 字段将其分组到一个新数组中.

And I would like to group it into a new array based on the id field in each subarray.

array
(
    10 => array
          (
            e => array ( id = 10, name = bananas )
          )
    20 => array
          (
            a => array ( id = 20, name = chimpanzee )
            c => array ( id = 20, name = dynasty )
          )
    40 => array
          (
            b => array ( id = 40, name = meeting )
          )
    50 => array
          (
            d => array ( id = 50, name = chocolate )
            f => array ( id = 50, name = fantasy )
            g => array ( id = 50, name = football )
          )
)

推荐答案

$arr = array();

foreach ($old_arr as $key => $item) {
   $arr[$item['id']][$key] = $item;
}

ksort($arr, SORT_NUMERIC);

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