PHP数组唯一值

Question

我有这样的数组

Array
(
    [0] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [1] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [2] => Array
        (
            [id] => LA
            [name] => Lanchile
        )

    [3] => Array
        (
            [id] => LA
            [name] => Lanchile
        )

    [4] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [5] => Array
        (
            [id] => BA
            [name] => British Airways
        )

)

而且我想得到

Array
(
    [0] => Array
        (
            [id] => BA
            [name] => British Airways
        )

    [1] => Array
        (
            [id] => LA
            [name] => Lanchile
        )
)

但在使用array_unique函数后，我只有

Array
(
    [0] => Array
        (
            [id] => BA
            [name] => British Airways
        )

)

我究竟做错了什么？

Answer 1

array_unique(my_array, SORT_REGULAR)

按照评论的要求。 :)

Answer 2

如上所述，array_unique不支持多维数组，但您可以迭代数据并构建自己的数组

<?php
$airlines = array(
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
);
$tmp = array();
foreach ($airlines as $item) {
    if (!in_array($item['id'], $tmp)) {
        $unique[] = $item;
        $tmp[] = $item['id'];
    }
}

var_dump($unique); // $unqiue will have your desired results in it var_dump was just for testing

Answer 3

 array_unique is not intended to work on multi dimensional arrays.

你需要循环数组

array_unique

Answer 4

$airlines = array(
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
    array('id' => 'BA', 'name' => 'British Airways'),
    array('id' => 'LA', 'name' => 'Lanchile'),
);


$unique = array_map(
    'unserialize',
    array_unique(
        array_map(
            'serialize',
            $airlines
        )
    )
);

var_dump($unique);