動態php循環與optlabels

Question

試圖創建一個帶有標籤的選擇列表。包含0的所有內容都屬於標籤標籤，其子標籤如下。這裏是我的表是如何建立

和代碼我有我已經知道錯了

$query = sprintf("SELECT * FROM `itemCat`"); 


$label = ""; 
while($row = $this->localDB->fetch_assoc($result)) 
{ 
    if ($row['itemCatName'] != $label && $row['itemCatChildof']=='0') 
    { 
    $cat .= '<optgroup label="'.$row['itemCatName'].'">'; 
    } 

    $cat .= '<option value="' . $row['iditemCat'] . '">' . $row['itemCatName'] . '</option>'; 
    $label = $row['itemCatName']; 
} 
return $cat; 
} 

Answer 1

我會personnaly去這樣的事情：創建一個新的有序排列，其中每個父元素包含了他所有的孩子在一個子陣列

<?php 

$data = 
[ 
    ['iditemCat' => 1, 'itemCatName' => 'Admin', 'itemCatChildof' => 0], 
    ['iditemCat' => 2, 'itemCatName' => 'Admin2', 'itemCatChildof' => 1], 
    ['iditemCat' => 3, 'itemCatName' => 'Admin3', 'itemCatChildof' => 1], 
    ['iditemCat' => 4, 'itemCatName' => 'Admin4', 'itemCatChildof' => 1], 
    ['iditemCat' => 5, 'itemCatName' => 'Admin5', 'itemCatChildof' => 0], 
    ['iditemCat' => 6, 'itemCatName' => 'Admin6', 'itemCatChildof' => 5], 
    ['iditemCat' => 7, 'itemCatName' => 'Admin7', 'itemCatChildof' => 5], 
    ['iditemCat' => 8, 'itemCatName' => 'Admin8', 'itemCatChildof' => 5] 
]; 

$sortedArray = []; 

foreach($data as $d) { 
    if($d['itemCatChildof'] == 0) { 
     $sortedArray[$d['iditemCat']] = $d; 
    } else { 
     $sortedArray[$d['itemCatChildof']]['children'][] = $d; 
    } 
} 

它會返回你是這樣的：

Array 
(
    [1] => Array 
     (
      [iditemCat] => 1 
      [itemCatName] => Admin 
      [itemCatChildof] => 0 
      [children] => Array 
       (
        [0] => Array 
         (
          [iditemCat] => 2 
          [itemCatName] => Admin2 
          [itemCatChildof] => 1 
         ) 

        [1] => Array 
         (
          [iditemCat] => 3 
          [itemCatName] => Admin3 
          [itemCatChildof] => 1 
         ) 

        [2] => Array 
         (
          [iditemCat] => 4 
          [itemCatName] => Admin4 
          [itemCatChildof] => 1 
         ) 

       ) 

     ) 

    [5] => Array 
     (
      [iditemCat] => 5 
      [itemCatName] => Admin5 
      [itemCatChildof] => 0 
      [children] => Array 
       (
        [0] => Array 
         (
          [iditemCat] => 6 
          [itemCatName] => Admin6 
          [itemCatChildof] => 5 
         ) 

        [1] => Array 
         (
          [iditemCat] => 7 
          [itemCatName] => Admin7 
          [itemCatChildof] => 5 
         ) 

        [2] => Array 
         (
          [iditemCat] => 8 
          [itemCatName] => Admin8 
          [itemCatChildof] => 5 
         ) 

       ) 

     ) 

) 

所以你就必須去探索它是這樣的：

<select name="foo" id="foo"> 
<?php foreach($sortedArray as $value): ?> 
    <optgroup label="<?= $value['itemCatName']; ?>"> 
     <?php foreach($value['children'] as $child): ?> 
      <option value="<?= $child['iditemCat']; ?>"><?= $child['itemCatName']; ?></option> 
     <?php endforeach; ?> 
    </optgroup> 
<?php endforeach; ?> 
</select> 

Answer 2

謝謝@Sakuto指着我在正確的方向。這是它是如何解決的

public function getAllCat(){ 
    $query = sprintf("SELECT * FROM `itemCat`"); 
     $result = $this->localDB->query($query);  
$cat = '<option value="">Please Select</option>'; 
$data = array(); 
    while($row = $this->localDB->fetch_assoc($result)) 
{ 
array_push($data, array('iditemCat'=>$row['iditemCat'], 'itemCatName'=>$row['itemCatName'], 'itemCatChildof'=>$row['itemCatChildof'])); 

} 

$sortedArray = array(); 
foreach($data as $d) { 
     if($d['itemCatChildof'] == 0) { 
      $sortedArray[$d['iditemCat']] = $d; 
     } else { 
      $sortedArray[$d['itemCatChildof']]['children'][] = $d; 
     } 
    } 


foreach($sortedArray as $value){ 
    $cat .= '<optgroup label="'.$value['itemCatName'].'">'; 
    foreach($value['children'] as $child){ 
     $cat .='<option  value="'.$child['iditemCat'].'">'.$child['itemCatName'].'</option>'; 
    } 
    $cat .=' </optgroup>'; 
} 

return $cat; 
}