按特定順序排列的PHP排序2d字符串數組

Question

我是新來的PHP，並試圖用特定順序數組排序字符串的二維數組。一直在尋找使用'usort'和'比較'，但是當使用2d數組和字符串時似乎無法將我的頭圍繞在它們周圍。

需要將數組輸入到方法並返回具有相同格式的排序數組。因此，對於數組中的每個條目，它將根據順序數組的順序對第二級「文件」值進行排序。任何建議如何做到這一點？

//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)); 

看到這麼刺激的第一和毒性是最後:)

Answer 1

的基本方法是通過陣列和陣列順序既迭代並重新分配鍵進入一個新的數組...

<?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 
?> 

輸出：

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

這可以通過巧妙地利用了PHP的來完成函數。你的電話可能看起來像這樣：

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