php - 如何根据特定值按降序对数组进行排序

Question

我有一系列新闻，比如

Array
(
  [0] => Array
    (
        [news_published] => 1337192831
        [news_category] => 5
    )

  [1] => Array
    (
        [news_published] => 1334566743
        [news_category] => 5
    )

  [2] => Array
    (
        [news_published] => 1340092425
        [news_category] => 6
    )

  [3] => Array
    (
        [news_published] => 1339740173
        [news_category] => 6
    )

  [4] => Array
    (
        [news_published] => 1336148837
        [news_category] => 6
    )
)

如何按降序对 news_published 进行排序....我尝试过使用“usort”，但无法正确找到结果，有人可以建议我吗？

Answer 1

试试这个 ：

$arr  = your array;
$sort = array();
foreach($arr as $k=>$v) {
    $sort['news_published'][$k] = $v['news_published'];
}

array_multisort($sort['news_published'], SORT_DESC, $arr);

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

Answer 2

<?php


 $array = array( array('news_published'=>'1337192831','news_category'=>'5'),
            array('news_published'=>'1337192231','news_category'=>'5'),                
            array('news_published'=>'1337192921','news_category'=>'6'),

           );
  / orignal array
 print_r($array);

foreach ($array as $key => $row) {
$new_published[$key] = $row['news_published'];
 }
array_multisort($new_published, SORT_DESC,$array);

 // sorted array
print_r($array);

 ?>

Answer 3

或这个：

function sortForMe($a, $b)
{
    if ((int)$a['news_published'] === (int)$b['news_published']) {
        return 0;
    }
    return (int)$a['news_published'] < (int)$b['news_published'] ? -1 : 1;
}

usort($array, 'sortForMe');

您可以使用类中的函数或静态方法-您的选择:)