用smarty和php創建類別樹

Question

我在我的web項目中有類別和子類別。我是新來的聰明人。 通常我使用下面的代碼來構建一個類別樹。主要類別由父ID = 0和所有子類別都有主類別ID作爲父ID定義

$sql = "SELECT * FROM categories ORDER BY category"; 
$res = $mysqli->query($sql); 
while ($row = mysqli_fetch_assoc($res)) { 
    $parent = intval($row['parent_id']); 
    if (!isset($categories[$parent])) { 
     $categories[$parent] = array(); 
    } 
    $categories[$parent][] = $row; 
} 
function build_categories($parent, $categories) { 
    if (isset($categories[$parent]) && count($categories[$parent])) { 
      foreach ($categories[$parent] as $category) { 

      $cat_name = $category['category']; 
      $cat_link = preg_replace("![^a-z0-9]+!i", "-", $cat_name); 
      $cat_link = urlencode($cat_link); 
      $cat_link = strtolower($cat_link); 

      if($category['parent_id']==0){ 
       echo '<li><a href="category-'.$category['cat_id'].'-'.$cat_link.'">' .$category['category'].'</a>'; 
      }else{ 
       echo '<li><a href="subcategory-'.$category['cat_id'].'-'.$cat_link.'"><span class="fa fa-angle-double-right"></span> '.$category['category'].'</a>';  
      } 
      echo build_categories($category['cat_id'], $categories); 
      echo '</li>'; 
     } 


    } 

} 

//output category tree 
build_categories(0, $categories); 

//表結構

cat_id | category | parent_id 
1   | cat 1  | 0 
1   | cat 2  | 0 
1   | cat 3  | 1 
1   | cat 4  | 2 
1   | cat 5  | 1 

請注意，上述代碼的工作只是不工作時，我將其分配給smarty變量。

但我似乎無法讓它與Smarty合作。瞭解你的幫助。

Answer 1

試試這個。在我的本地機器上運行良好。

require_once('smarty/Smarty.class.php'); 
$smarty = new Smarty(); 
$smarty->setTemplateDir('tpl'); 
$smarty->setCompileDir('tpl_c'); 
$mysqli = new mysqli('localhost', 'root', '', 'test'); 

$sql = "SELECT * FROM categories ORDER BY category"; 
$res = $mysqli->query($sql); 
while ($row = mysqli_fetch_assoc($res)) { 
    $parent = intval($row['parent_id']); 
    if (!isset($categories[$parent])) { 
     $categories[$parent] = array(); 
    } 
    $categories[$parent][] = $row; 
} 
function build_categories($parent, $categories) { 
    if (isset($categories[$parent]) && count($categories[$parent])) { 
     foreach ($categories[$parent] as $category) { 
      $cat_name = $category['category']; 
      $cat_link = preg_replace("![^a-z0-9]+!i", "-", $cat_name); 
      $cat_link = urlencode($cat_link); 
      $cat_link = strtolower($cat_link); 

      if($category['parent_id']==0){ 
       $result[] = '<li><a href="category-'.$category['cat_id'].'-'.$cat_link.'">' .$category['category'].'</a>'; 
      }else{ 
       $result[] = '<li><a href="subcategory-'.$category['cat_id'].'-'.$cat_link.'"><span class="fa fa-angle-double-right"></span> '.$category['category'].'</a>'; 
      } 
      $result[] = build_categories($category['cat_id'], $categories); 
      $result[] = '</li>'; 
      return implode('', $result); 
     } 
    } 
} 

$smarty->assign('smarty_var', build_categories(0, $categories)); 
$smarty->display('template.tpl'); 

編輯：

id| cat_id| category | parent_id  
1 | 1  | cat 1 main | 0 
2 | 2  | cat 2 child | 1 

編輯在腳本中使用添加表結構：更新功能

function build_categories($parent, $categories) { 
     foreach ($categories[$parent] as $category) { 
      $cat_name = $category['category']; 
      $cat_link = preg_replace("![^a-z0-9]+!i", "-", $cat_name); 
      $cat_link = urlencode($cat_link); 
      $cat_link = strtolower($cat_link); 

      if($category['parent_id']==0){ 
       $result[] = '<li><a href="category-'.$category['cat_id'].'-'.$cat_link.'">' .$category['category'].'</a>'; 
      }else{ 
       $result[] = '<li><a href="subcategory-'.$category['cat_id'].'-'.$cat_link.'"><span class="fa fa-angle-double-right"></span> '.$category['category'].'</a>'; 
      } 
      if(isset($categories[$category['cat_id']])) { 
       $result[] = build_categories($category['cat_id'], $categories); 
      } 
      $result[] = '</li>'; 
     } 
     return implode('', $result); 
}