PHP:按值对对象数组进行分组的函数 [英] PHP: Function to group array of objects by value

问题描述

我正在处理一个多维数组.如何按值删除重复项?在以下数组中，[0]、[2] 和 [5] 具有相同的 [ID].是否有一个函数可以根据特定值删除任何重复的数组?在这种情况下，我想删除数组 [2] 和数组 [5]，因为它们具有与数组 [0] 相同的 [ID].

I am working with a multi-dimensional array. How can I remove duplicates by value? In the following array, [0], [2] and [5] have the same [ID]. Is there a function that will remove any duplicate arrays based on a particular value? In this case, I would like to remove array [2] and array [5], as they have the same [ID] as array [0].

感谢您提供的任何信息.

Thank you for any information you may have.

        Array
(
    [0] => stdClass Object
        (
            [d] => 2010-10-18 03:30:04
            [ID] => 9
        )

    [1] => stdClass Object
        (
            [d] => 2010-10-18 03:30:20
            [ID] => 4
        )

    [2] => stdClass Object
        (
            [d] => 2010-11-03 16:46:34
            [ID] => 9
        )

    [3] => stdClass Object
        (
            [d] => 2010-11-02 03:19:14
            [ID] => 1
        )

    [4] => stdClass Object
        (
            [d] => 2010-05-12 04:57:34
            [ID] => 2
        )    

    [5] => stdClass Object
        (
            [d] => 2010-05-10 05:24:15
            [ID] => 9
        )

)

推荐答案

一种方法:($old_array 是你的数组，$new_array 将包含新的，删除了骗子，以该 ID 为键)

One way to do it: ($old_array is your array, and $new_array will contain the new one, dupes removed, keyed by that ID)

$new_array = array();
foreach ($old_array as $item)
  if (!array_key_exists($item->ID, $new_array))
    $new_array[$item->ID] = $item;

(我还没有测试过，但应该可以)

(I haven't tested this, but it should work)

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