Display Categories and subcategories using CodeIgniter - codeigniter

Question

I have two table in my database, One is Categories and the other is Sub_Categories, I want to display them like this:
Categorie 1
sub categoie 1
sub categoie 2
sub categoie 3
sub categoie 4
Categorie 2
sub categoie 1
sub categoie 2
sub categoie 3
sub categoie 4
But i don't know how to do this.
In my Database table i have this fields :
Categories: ID, Name, Icon.
Sub_Categories: ID, Categ_id, Name

Answer 1

This should work;
public function get_categories()
{
$query = $this->db->get('Categories');
$return = array();
foreach ($query->result() as $category)
{
$return[$category->id] = $category;
$return[$category->id]->subs = $this->get_sub_categories($category->id); // Get the categories sub categories
}
return $return;
}
public function get_sub_categories($category_id)
{
$this->db->where('Category', $category_id);
$query = $this->db->get('Sub_Categories');
return $query->result();
}
All this does is get's all the categories, but then gets all the subcategories for each of the categories. Calling the get_categories() function should return an object in the format you want.
I hope this helps.
Edit
You would call the get_categories function from your controller and pass it to the view;
$data['categories'] = $this->your_model->get_categories();
$this->load->view('view_file', $data);
Then within your view you would display them like this;
<ul>
<?php
foreach ($categories as $category)
{
?>
<li><?php echo $category->name; ?>
<?php
if(!empty($category->subs)) {
echo '<ul>';
foreach ($category->subs as $sub) {
echo '<li>' . $sub->name . '</li>';
}
echo '</ul>';
}
?>
</li>
<?php
}
?>
</ul>

Answer 2

Database
image for database table
Try this
in Model
public function getCategories()
{
$query = $this->db->query('select * from categories where cat_parent=0');
return $query->result_array();
}
public function getCategoriesSub($parent)
{
$query = $this->db->query("select * from categories where cat_parent='$parent'");
return $query->result_array();
}
in Controller
public function categories()
{
$data['mcats'] = $this->admin_model->getCategories();
foreach($data['mcats'] as $key =>$val){
$subcats = $this->admin_model->getCategoriesSub($val['cid']);
if($subcats){
$data['scats'][$val['cid']] = $subcats;
}
}
$this->load->view('admin/header');
$this->load->view('admin/category_list', $data);
$this->load->view('admin/footer');
}
In view
<ul>
<?php
foreach ($mcats as $key =>$val)
{
?>
<li><?php echo $val['cat_name']; ?>
<ul>
<?php
foreach ($scats[$val['cid']] as $sub) {
echo '<li>' . $sub['cat_name'] . '</li>';
}
?>
</ul>
</li>
<?php
}
?>
</ul>
its already working code - i think it is usefull