How to Build Hierarchical Menus With Unlimited Depth in PHP and MySQL?
Oct 28, 2024 pm 10:20 PMBuilding Hierarchical Menus with Unlimited Depth
In this guide, we'll explore how to create nested menus with an unlimited number of levels using PHP and MySQL.
Database Structure
We'll use a database structure where each menu item has an "id," "parent_id," and "title." The "parent_id" field stores the ID of the menu item's parent, with "0" indicating a top-level menu.
Fetching Submenus
To fetch submenus for a parent menu, we can use the following code:
<code class="php"><?php $list = $obj->childmenu($parentid); foreach($list as $menu) { extract($menu); echo '<li><a href="#">'.$name.'</a></li>'; } ?></code>
Checking for Child Submenus
To check if a menu has child submenus, we can modify the above code as follows:
<code class="php"><?php $list = $obj->childmenu($parentid); foreach($list as $menu) { extract($menu); if (count($obj->childmenu($id)) > 0) { echo '<li><a href="#">'.$name.'</a><ul class="submenu">'; $list2 = $obj->childmenu($id); foreach($list2 as $menu2) { extract($menu2); echo '<li><a href="#">'.$name.'</a></li>'; } echo '</ul> </li>'; } else { echo '<li><a href="#">'.$name.'</a></li>'; } } ?></code>
This code uses a nested loop to fetch and display submenus, ensuring that all levels of the hierarchy are captured. The result will be a nested HTML structure with menu items and their corresponding submenus.
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