php - php数组根据值在数组内排序

Question

我有如下数组

Array
(
    [0] => Array
        (
            [0] => 1280
            [id] => 1280
        )

    [1] => Array
        (
            [0] => 2261
            [id] => 2261
        )

    [2] => Array
        (
            [0] => 1280
            [id] => 1280
        )
)

在php中，如何根据“id”的值从低到高排序？

Answer 1

使用usort()，例如：

function sortById($x, $y) {
    return $x['id'] - $y['id'];
}

usort($array, 'sortById');
echo "<pre>"; print_r($array);

Answer 2

使用array_multisort()如下：

<?php
$multiArray = Array(
    Array("id" => 120, "name" => "Defg"),
    Array("id" => 62, "name" => "Abcd"),
    Array("id" => 99, "name" => "Bcde"),
    Array("id" => 2, "name" => "Cdef"));
$tmp = Array();
foreach($multiArray as &$ma)
    $tmp[] = &$ma["id"];
array_multisort($tmp, $multiArray);
foreach($multiArray as &$ma)
    echo $ma["id"]."<br/>";

/* Outputs
    2
62
99
120
*/
?>