php二維數(shù)組怎么根據(jù)某個(gè)字段排序

可以使用array_multisort()函數(shù)來根據(jù)某個(gè)字段對(duì)二維數(shù)組進(jìn)行排序。

假設(shè)有以下二維數(shù)組：

$users = array(
    array('name' => 'John', 'age' => 25, 'city' => 'New York'),
    array('name' => 'Amy', 'age' => 30, 'city' => 'Los Angeles'),
    array('name' => 'Peter', 'age' => 20, 'city' => 'Chicago')
);

如果要根據(jù)age字段對(duì)數(shù)組進(jìn)行升序排序，可以使用以下代碼：

$ages = array_column($users, 'age'); // 提取所有用戶的age字段值
array_multisort($ages, SORT_ASC, $users); // 根據(jù)age字段值進(jìn)行排序

print_r($users);

輸出結(jié)果為：

Array
(
    [0] => Array
        (
            [name] => Peter
            [age] => 20
            [city] => Chicago
        )

    [1] => Array
        (
            [name] => John
            [age] => 25
            [city] => New York
        )

    [2] => Array
        (
            [name] => Amy
            [age] => 30
            [city] => Los Angeles
        )
)

如果要根據(jù)city字段對(duì)數(shù)組進(jìn)行降序排序，可以使用以下代碼：

$cities = array_column($users, 'city'); // 提取所有用戶的city字段值
array_multisort($cities, SORT_DESC, $users); // 根據(jù)city字段值進(jìn)行排序

print_r($users);

輸出結(jié)果為：

Array
(
    [0] => Array
        (
            [name] => Amy
            [age] => 30
            [city] => Los Angeles
        )

    [1] => Array
        (
            [name] => Peter
            [age] => 20
            [city] => Chicago
        )

    [2] => Array
        (
            [name] => John
            [age] => 25
            [city] => New York
        )
)