PHP Recursive bootstrap dropdown menu - php

Question

I use this code to create a bootstrap dropdown for an infinte menu
<ul class="nav">
<?php
$menu_items = array(
(object) array('id'=>'1', 'name'=>'Electronics', 'parent_menu_id'=>'0'),
(object) array('id'=>'2', 'name'=>'Books', 'parent_menu_id'=>'0'),
(object) array('id'=>'3', 'name'=>'Toys', 'parent_menu_id'=>'0'),
(object) array('id'=>'4', 'name'=>'Kitchen', 'parent_menu_id'=>'0'),
(object) array('id'=>'5', 'name'=>'Apparel', 'parent_menu_id'=>'0'),
(object) array('id'=>'6', 'name'=>'Shirts', 'parent_menu_id'=>'5'),
(object) array('id'=>'7', 'name'=>'Pants', 'parent_menu_id'=>'5'),
(object) array('id'=>'8', 'name'=>'Hats', 'parent_menu_id'=>'5'),
(object) array('id'=>'9', 'name'=>'Gloves', 'parent_menu_id'=>'5'),
(object) array('id'=>'10', 'name'=>'Ballcaps', 'parent_menu_id'=>'8'),
(object) array('id'=>'11', 'name'=>'Beanies', 'parent_menu_id'=>'8'),
(object) array('id'=>'12', 'name'=>'Wool', 'parent_menu_id'=>'11'),
(object) array('id'=>'13', 'name'=>'Polyester', 'parent_menu_id'=>'11'),
(object) array('id'=>'14', 'name'=>'Jimsider.com', 'parent_menu_id'=>'4'),
);
global $menuItems;
global $parentMenuIds;
//create an array of parent_menu_ids to search through and find out if the current items have an children
foreach($menu_items as $parentId)
{
$parentMenuIds[] = $parentId->parent_menu_id;
}
//assign the menu items to the global array to use in the function
$menuItems = $menu_items;
//recursive function that prints categories as a nested html unorderd list
function generate_menu($parent)
{
$has_childs = false;
//this prevents printing 'ul' if we don't have subcategories for this category
global $menuItems;
global $parentMenuIds;
//use global array variable instead of a local variable to lower stack memory requierment
foreach($menuItems as $key => $value)
{
if ($value->parent_menu_id == $parent)
{
//if this is the first child print '<ul>'
if ($has_childs === false)
{
//don't print '<ul>' multiple times
$has_childs = true;
if($parent != 0)
{
echo '<ul class="dropdown-menu">';
}
}
if($value->parent_menu_id == 0 && in_array($value->id, $parentMenuIds))
{
echo '<li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">' . $value->name . '<b class="caret"></b></a>';
}
else if($value->parent_menu_id != 0 && in_array($value->id, $parentMenuIds))
{
echo '<li class="dropdown-submenu">' . $value->name . '';
}
else
{
echo '<li>' . $value->name . '';
}
generate_menu($value->id);
//call function again to generate nested list for subcategories belonging to this category
echo '</li>';
}
}
if ($has_childs === true) echo '</ul>';
}
generate_menu(0);
?>
<!-- End Dynamic Nav -->
</li>
</ul>
But The output comes as
<ul class="nav">
<li>Electronics</li>
<li>Books</li>
<li>Toys</li>
<li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Kitchen<b class="caret"></b></a>
<ul class="dropdown-menu">
<li>Jimsider.com</li>
</ul>
</li>
.......
</ul>
All the menu item with parent_menu_id = 0 gets listed as menu , instead I need everything listed under one menu 'Categories'

Answer 1

function toULlistproduct($arr)
{
$html = '<ul>'.PHP_EOL;
foreach ($arr as $k => $v)
{
if(is_array($v)){
$html .= '<li><a href="#" id="' . $k . '" >'.$k.'</a></li>' ;
$html .= toULlistproduct($v);
}else{
$html .= '<li><a href="#" id="' . $k . '" >'.$v.'</a></li>' ;
}
}
$html .= '</ul>'.PHP_EOL;
return $html;
}
$arr = array(
'a' => array(1,2,3,4,5,6,7,8,9,...),
);
echo toULlistproduct($arr);