PHP 按特定顺序数组对二维字符串数组进行排序

Question

我是 php 的新手，一直在尝试使用特定顺序数组对二维字符串数组进行排序。一直在考虑使用 'usort' 和 'comparison'，但在使用 2d 数组和字符串时似乎无法理解它们。

需要将数组输入方法和return排序的数组，格式相同。因此，对于数组中的每个条目，它将根据顺序数组的顺序对第 2 级 'file' 值进行排序。有什么建议可以实现吗？

//actual array to be sorted by 'file'
$Array ( 
[0] => Array ( [source] => img/table/icon/toxic.svg [file] => toxic ) 
[1] => Array ( [source] => img/table/icon/health.svg [file] => health ) 
[2] => Array ( [source] => img/table/icon/irritant.svg [file] => irritant   ));

//order array with desired sort order
$order = array("irritant","corrosive","environment" ,"health","toxic","oxidizing","flammable","explosive","gas");

//Desired Output Result
$Array ( 
[0] => Array ( [source] => img/table/icon/irritant.svg [file] => irritant )
[1] => Array ( [source] => img/table/icon/health.svg [file] => health ) 
[2] => Array ( [source] => img/table/icon/toxic.svg [file] => toxic ) );

看到刺激性在前，毒性在后:)

Answer 1

基本方法是遍历数组和顺序数组并将键重新分配到新数组中...

<?php
    $a[] = array('source' => 'img/table/icon/toxic.svg','file'=>'toxic');
    $a[] = array('source' => 'img/table/icon/health.svg','file'=>'health');
    $a[] = array('source' => 'img/table/icon/irritant.svg','file'=>'irritant');

    $b = array();

    $order = array("irritant","corrosive","environment","health","toxic","oxidizing","flammable","explosive","gas");

    foreach ($a as $arr) {
        foreach ($order as $key => $o) {
            if ($o == $arr['file']) {
                $b[$key] = $arr;
                break;
            }
        }
    }
    ksort($b);
    print_r(array_values($b)); // or print_r($b); if you dont want sequential keys
?>

输出：

Array ( 
[0] => Array ( [source] => img/table/icon/irritant.svg [file] => irritant ) 
[1] => Array ( [source] => img/table/icon/health.svg [file] => health ) 
[2] => Array ( [source] => img/table/icon/toxic.svg [file] => toxic )
)

Answer 2

这可以通过巧妙地使用 PHP 的 usort 功能来实现。您的电话可能看起来像这样：

$order = array("irritant","corrosive","environment" ,"health","toxic","oxidizing","flammable","explosive","gas");
usort($array, function ($a, $b) use ($order) {
    $aOrder = array_search($a['file'], $order);
    $bOrder = array_search($b['file'], $order);
    if ($aOrder == $bOrder) return 0;
    return ($aOrder > $bOrder) ? 1 : -1;
});

PHP 按特定顺序数组对二维字符串数组进行排序

PHP sort 2d string array by specific order array

php

arrays

sorting

multidimensional-array