php - 从数组的数组中删除重复的数组

Question

这是我正在处理的数组的示例:

Array
(
[0] => Array
    (
        [id] => 1331
        [shortname] => MCS-115-113C
        [userid] => 663
        [email] => asdfasfd@asdfasfd.br
        [username] => FOOBARBAZ
        [nombrecompleto] => asdfasdf
        [lastlogin] => 1367501486
    )
[1] => Array
    (
        [id] => 1331
        [shortname] => MAFA-EOOF
        [userid] => 323
        [email] => asdfasfd@asdfasfd.br
        [username] => FOOBARBAZ
        [nombrecompleto] => asdfasdf
        [lastlogin] => 136732186
    )
[2] => Array
    (
        [id] => 1331
        [shortname] => MKT-FOOBAR
        [userid] => 434
        [email] => asdfasfd@asdfasfd.br
        [username] => adsfasdf
        [nombrecompleto] => asdfasdf
        [lastlogin] => 1367234486
    )

在我的例子中，我想比较数组中的 username 元素并删除重复项。

所以在这种情况下，我只会返回两个元素，用户名 FOOBARBAZ 和 adsfasdf:

Array
(
[0] => Array
    (
        [id] => 1331
        [shortname] => MAFA-EOOF
        [userid] => 323
        [email] => asdfasfd@asdfasfd.br
        [username] => FOOBARBAZ
        [nombrecompleto] => asdfasdf
        [lastlogin] => 136732186
    )
[1] => Array
    (
        [id] => 1331
        [shortname] => MKT-FOOBAR
        [userid] => 434
        [email] => asdfasfd@asdfasfd.br
        [username] => adsfasdf
        [nombrecompleto] => asdfasdf
        [lastlogin] => 1367234486
    )

我如何在 PHP 中完成此操作？

Answer 1

使用 array_unique() 很容易实现(而且速度很快，因为它是内部的) .但是，默认情况下，此函数会将所有内容转换为字符串，因此您需要传递 SORT_REGULAR 常量。 ( Demo )

<?php
$data = array(
    array(
        'id' => 0,
        'title' => 'Abc'
    ),
    array(
        'id' => 2,
        'title' => 'Def',
        'content' => 'Stackoverflow!'
    ),
    array(
        'id' => 0,
        'title' => 'Abc'
    )
);

var_dump(array_unique($data, SORT_REGULAR));