Menu from database with unlimited sub-menus/items? - php

Question

I'm trying to build this function that display a menu with sub menus from a database. Something that can show like sub-sub-sub-menus and so on... If that's ever something I need.
In the database i have 2 tables, menu and menuItem.
menu
menuItem
php file
function get_menu($id) {
require(dirname(__FILE__) . '/config.php');
// main base
$menu = " SELECT id, menu_name, menu_data, menu_order
FROM mos_menuItem
WHERE menu_parent_id='$id'
AND menu_sub='0'
ORDER BY menu_order";
$menuResult = mysqli_query($conn, $menu);
echo '<ul>';
while ($menuRow = mysqli_fetch_row($menuResult)) {
// main menu
echo '<li>'. $menuRow[1] .'</li>';
// sub base
$sub = "SELECT id, menu_name, menu_data, menu_order, menu_sub
FROM mos_menuItem
WHERE menu_parent_id='$menuRow[0]'
AND menu_sub>='1'
ORDER BY menu_order";
$subResult = mysqli_query($conn, $sub);
echo '<ul>';
while ($subRow = mysqli_fetch_row($subResult)) {
echo '<li>'. $subRow[1] .'</li>';
}
echo '</ul>';
}
echo '</ul>';
mysqli_close($conn);
}
so I need to loop something inside itself? I'm not sure where to go from here.

Answer 1

Recursion is your best friend here.
I am not sure what purpose is served by the menu_sub field. I assume it tells you at what level it is in the menu hierarchy. If that is the case, then you can safely ignore it (menu_parent_id would suffice) to create this multi-level menu hierarchy.
function getMenus($menu_id, $is_sub=false){
$sql = "SELECT id, menu_name, menu_data, menu_order
FROM mos_menuItem
WHERE menu_parent_id='$menu_id'
ORDER BY menu_order";
$mResult = mysqli_query($conn, $sub);
echo '<ul>';
while ($mRow = mysqli_fetch_row($mResult)) {
echo '<li>'. $mRow[1] .'';
getMenus($mRow[0], true);
echo '</li>';
}
echo '</ul>';
}
This does have one drawback where if you want the hierarchy to start from a parent other than 0 (I assume your root menu_id is 0), that particular menu would not show up in the hierarchy.

Answer 2

So after some trial and error i figure it out. It really helped to look at Sheikh Azad code.
The only difference is in my function i have AND menu_sub='$sub' to make it not going loop the main menu item if the id is the same.. If that make sense.
The function
function mos_get_menu_editor($menuId, $sub) {
require(dirname(__FILE__) . '/config.php');
$item = " SELECT id, menu_name, menu_data, menu_order, menu_sub
FROM mos_menuItem
WHERE menu_parent_id='$menuId'
AND menu_sub='$sub'
ORDER BY menu_order";
$itemResult = mysqli_query($conn, $item);
echo '<ul>';
while ($itemRow = mysqli_fetch_row($itemResult)) {
echo '<li>'. $itemRow[1] .'</li>';
mos_get_menu_editor($itemRow[0], 1);
}
echo '</ul>';
mysqli_close($conn);
}