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在php 7中对关联数组排序[重复]

sorting php

Nidhoegger · 技术社区 · 7 年前

这个问题已经有了答案:

How to sort an array of arrays in php? 2个答案

给出以下示例:

$user1 = array('username' => 'test1', 'score' => 2000, 'someotherdata' => 1.0);
$user2 = array('username' => 'test2', 'score' => 4325, 'someotherdata' => 2.0);
$user3 = array('username' => 'test3', 'score' => 624534, 'someotherdata' => 3.0);
$user4 = array('username' => 'test4', 'score' => 564, 'someotherdata' => 1.4);
$user5 = array('username' => 'test5', 'score' => 34256, 'someotherdata' => 1.5);
$user6 = array('username' => 'test6', 'score' => 5476, 'someotherdata' => 1.8);

$arr = array($user1, $user2, $user3, $user4, $user5, $user6);

我怎么能分类 $arr 在田野边 score 在php 7中表现不错?我有一个自己制作的bubblesort,但是有没有一种方法可以使用内置的php 7功能来很好地实现它,因为bubblesort非常昂贵(我可以自己做一个quicksort,但是在我这样做之前,我想知道是否有更好的方法)。

2 回复 | 直到 7 年前

Eddie 7 年前

你可以用 usort

$user1 = array('username' => 'test1', 'score' => 2000, 'someotherdata' => 1.0);
$user2 = array('username' => 'test2', 'score' => 4325, 'someotherdata' => 2.0);
$user3 = array('username' => 'test3', 'score' => 624534, 'someotherdata' => 3.0);
$user4 = array('username' => 'test4', 'score' => 564, 'someotherdata' => 1.4);
$user5 = array('username' => 'test5', 'score' => 34256, 'someotherdata' => 1.5);
$user6 = array('username' => 'test6', 'score' => 5476, 'someotherdata' => 1.8);

$arr = array($user1, $user2, $user3, $user4, $user5, $user6);

usort($arr, function($a, $b){
    return $a['score'] - $b['score'];
});

echo "<pre>";
print_r( $arr );
echo "</pre>";

这将导致:

Array
(
    [0] => Array
        (
            [username] => test4
            [score] => 564
            [someotherdata] => 1.4
        )

    [1] => Array
        (
            [username] => test1
            [score] => 2000
            [someotherdata] => 1
        )

    [2] => Array
        (
            [username] => test2
            [score] => 4325
            [someotherdata] => 2
        )

    [3] => Array
        (
            [username] => test6
            [score] => 5476
            [someotherdata] => 1.8
        )

    [4] => Array
        (
            [username] => test5
            [score] => 34256
            [someotherdata] => 1.5
        )

    [5] => Array
        (
            [username] => test3
            [score] => 624534
            [someotherdata] => 3
        )

)

Doc: usort()

Bhumi Shah 7 年前

使用多重排序

$user1 = array('username' => 'test1', 'score' => 2000, 'someotherdata' => 1.0);
$user2 = array('username' => 'test2', 'score' => 4325, 'someotherdata' => 2.0);
$user3 = array('username' => 'test3', 'score' => 624534, 'someotherdata' => 3.0);
$user4 = array('username' => 'test4', 'score' => 564, 'someotherdata' => 1.4);
$user5 = array('username' => 'test5', 'score' => 34256, 'someotherdata' => 1.5);
$user6 = array('username' => 'test6', 'score' => 5476, 'someotherdata' => 1.8);

$arr = array($user1, $user2, $user3, $user4, $user5, $user6);

$score = array();
foreach ($arr as $key => $row)
{
    $score[$key] = $row['score'];
}
array_multisort($score, SORT_DESC, $arr);
echo "<pre>";
print_r($score);
echo "</pre>";