[英]Listing Categories then subcategories in PHP from MySQL database
我一直致力於構建一個簡單的電子商務系統的項目,在我開始顯示類別導航之前,該系統一直運行良好。
當我在 MySQL 中構建類別時,我有類似的東西:
id name parent_id
1 books null
2 art 1
3 biography 1
4 games null
5 electronics null
6 FPS 4
我編寫了以下 SQL 來檢索父類別,然后是子類別:
SELECT parent.name AS parent_name, child1.name AS child1_name
FROM categories AS parent
LEFT OUTER JOIN categories AS child1 ON child1.parent_id = parent.id
WHERE parent.parent_id IS NULL
ORDER BY parent_name, child1_name
結果是一個包含多個數組的數組:
Array
(
[0] => Array
(
[parent_name] => Books
[child1_name] => Art
)
[1] => Array
(
[parent_name] => Books
[child1_name] => Biography
)
[2] => Array
(
[parent_name] => Clothes, Shoes & Watches
[child1_name] =>
)
[3] => Array
(
[parent_name] => Computers & Office
[child1_name] =>
)
[4] => Array
(
[parent_name] => Electronics
[child1_name] =>
)
)
我無法將此信息顯示為無序列表。 想要的效果是這樣的:
<ul>
<li>Books
<ul>
<li>Art</li>
<li>Biography</li>
</ul>
</li>
<li>Computers</li>
<li>Electronics</li>
</ul>
有沒有人有解決這個問題的方法? 我是否需要更改我的 MySQL 代碼甚至數據庫結構?
提前致謝。
解決方案並不簡單,但可以為你工作:)。
$newArray = array();
foreach($arrayFromDatabase as $key => $category){
//replace key
$newArray[$category['parent_name']][] = $category['child1_name'];
}
//Open list
$toEcho = "<ul>";
foreach($newArray as $name => $subCat){
if(!empty($subCat)){
$toEcho_ = "<ul>";
foreach($subCat as $cat){
$toEcho_ .= "<li>$cat</li>";
}
$toEcho_ .= "</ul>";
$toEcho .= "<li>$name $toEcho_</li>";
} else{
$toEcho .= "<li>$name</li>";
}
}
//Close list
echo $toEcho . "</ul>";
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