php 多级导航显示

写一次,想一次...重新做一次...  这回就放这了..以后用直接过来copy.

第一段代码

得到要显示的类别.

一级目录放在categories[0],

二级目录放在categories[1],

三级目录放在categories[2],

....以此类推

不过一般最多到3级就不再往下分了.

	$cpath = array();
	if(!empty($_REQUEST["parentId"])){
		//category path
		//get the category path
//put current category id in $cpath
		$current_category["parentId"] = $_REQUEST["parentId"];

// put parent category id in $cpath 		
do{
array_unshift($cpath,$current_category["parentId"]);
			$data_category = array(
				"id" => $current_category["parentId"]
			);
			$current_category = array();
			$current_category = pos($db_conn->search($db_category,$data_category));
		}while(!empty($current_category["parentId"]));
	}
	//add the first level category parentId
	array_unshift($cpath,"null");
	// get all categories
	$categories_level_count = sizeof($cpath);
	for($i=0;$i $cpath[$i]
		);
		//get first level categories
		$categories[$i] = $db_conn->search($db_category,$data_category);
//		echo $db_category->search($data_category)."";
	}

第二段代码是将菜单以

<ul>
  <li>
      <ul>
        ...
      </ul>
  </li>
</ul>

的形式显示菜单

			function show_left_navigation($i){
				global $categories,$cpath;
				if(empty($categories[$i]))
					return;
				echo '<ul>';
				foreach($categories[$i] as $id=>$category){
					echo '';
					if($id==end($cpath))
						echo '<a href="advancedSearch.php?parentId='.$id.'">'.$category["name"].'</a>';
					else
						echo '<a href="advancedSearch.php?parentId='.$id.'">'.$category["name"].'</a>';
					if(in_array($id,$cpath))
						show_left_navigation($i+1);
					echo '';
				}
				echo '</ul>'; 
			}
			show_left_navigation(0);