如何根据数组中的特定字段对数组进行排序? [英] How to sort an array based on a specific field in the array?

问题描述

如何根据数组中的两个特定值对数组进行排序?例如:

How can I sort an array based on two specific values within the array? For instance:

$arr = array(
             array('a' => array('field1' => 'Abc', 'field2' => 'Def'), 'b' => 0)
             array('a' => array('field1' => 'Ghi', 'field2' => 'Jkl'), 'b' => 0)
            );

我想根据 $arr[$i]['a']['field1'] 变量对这个数组进行排序.我该怎么做?

I want to sort this array based on the $arr[$i]['a']['field1'] variable. How can I do that?

推荐答案

试试这个:

function cmp($a, $b) {
    if ($a['a']['field1'] == $b['a']['field1'] )
        return 0;
    return ( $a['a']['field1'] < $b['a']['field1'] ) ? -1 : 1;
}

uasort($arr, 'cmp');

这只是对 PHP 文档页面上提供的示例稍作改动:http://www.php.net/manual/en/function.uasort.php

This is just a slight alteration of the example provided on the PHP documentation page: http://www.php.net/manual/en/function.uasort.php

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