按特定顺序数组对2d字符串数组进行PHP排序

Question

我对php很陌生，我一直试图用一个特定的order数组对一个2d字符串数组进行排序。一直在使用“usort”和“比较法”，但当使用2d数组和字符串时，我似乎无法将头绕在它们周围。

需要输入数组到方法和返回排序数组，以相同的格式。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二级“文件”值进行排序。对如何做到这一点有什么建议吗？

//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 ) );

第一次看到刺激，最后看到有毒:)

Answer 1

基本的方法是迭代数组和顺序数组，并将键重新分配到一个新的数组中。

<?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
?>

产出：

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的乌斯托函数来实现。你的电话看起来可能是这样的：

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