how to list sub categories?

Question

Hi Everyone I am trying to lis subcats in the main categories like this:

Maincat1 -subcat Maincat2 -subcat

Please see the image

This is the code listing main cats:

in the global_header.php

$sql_select_cats_list = $db->query("SELECT category_id, items_counter, hover_title, image_path FROM
            " . DB_PREFIX . "categories WHERE parent_id=0 AND hidden=0 AND user_id=0 AND enable_auctions=1 ORDER BY order_id ASC, name ASC");

    $template->set('sql_select_cats_list', $sql_select_cats_list);

    $category_box_content = $template->process('categories_box.tpl.php');
    $template->set('category_box_content', $category_box_content);

And this is the categories_box.tpl.php

fetch_array($sql_select_cats_list)) 
{
    $category_link = process_link('categories', 
        array('category' => $category_lang[$cats_header_details['category_id']],
              'parent_id' => $cats_header_details['category_id']));
?>
   
       
          alt="">
              
               
              
              ' . $cats_header_details['items_counter'] . ')' :
                      '') :
                  '');
              ?>

Here is my original function listing categories on function.php

function category_navigator ($parent_id, $show_links = true, $show_category = true, $page_link = null, $additional_vars = null, $none_msg = null, $reverse_categories = false)
{
    global $reverse_categoy_lang, $category_lang, $db;

    (string) $display_output = NULL;
    (int) $counter = 0;

    $none_msg = ($none_msg) ? $none_msg : GMSG_ALL_CATEGORIES;

    $page_link = ($page_link) ? $page_link : $_SERVER['PHP_SELF'];
    if($parent_id > 0)
    {
        $root_id = $parent_id;
        while ($root_id > 0)
        {
            $row_category = $db->get_sql_row("SELECT category_id, name, parent_id FROM 
                " . DB_PREFIX . (($reverse_categories) ? 'reverse_categories' : 'categories') . " WHERE 
                category_id=" . $root_id . " LIMIT 0,1");

            if($counter == 0)
            {
                $display_output = ($reverse_categories) ? $reverse_category_lang[$row_category['category_id']] : $category_lang[$row_category['category_id']];
                $display_output = (!empty($display_output)) ? $display_output : $row_category['name'];
            }
            else if($parent_id != $root_id)
            {
                $category_name = ($reverse_categories) ? $reverse_category_lang[$row_category['category_id']] : $category_lang[$row_category['category_id']];
                $category_name = (!empty($category_name)) ? $category_name : $row_category['name'];

                $display_output = (($show_links) ? '' : '') . $category_name . (($show_links) ? '' : '') . ' > ' . $display_output;
            }
            $counter++;
            $root_id = $row_category['parent_id'];
        }
        $display_output = (($show_links && $show_category) ? ' ' . GMSG_CATEGORY . ': ' : '') . $display_output;
    }

    $display_output = (empty($display_output)) ? $none_msg : $display_output;

    return $display_output;
}

Database name is : categories

table : categories  
    | category_id +   parent_id +        name         |
    | 1             |   0        |     Flower         |
    | 2             |   0        |     Wall Decor     |
    | 3             |   0        |     Stylish Living |
    | 4             |   1        |     Mug            |
    | 5             |   1        |     Sun Flower     |

I need help to do this please.
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Last modified:

Solved special thanks to @furas

Code:

 
               $main_category['category']['name'], 'parent_id' => $main_category['category']['category_id']));
    ?>
    
     alt="">
     
             ' . $main_category['items_counter'] . ')' : '') : '');?>
       $sub_category['name'], 'parent_id' => $sub_category['category_id']));   
        ?>       
     
       
        alt="">
        
             ' . $sub_category['items_counter'] . ')' : '') : '');?>

furas · Accepted Answer

Pseudocode:

get_from_database_main_categories();

while( i_have_categories ) {
    print_category();
    get_from_database_subcategories_for_current_category();
    print_subcategories();
}

or maybe you can get all categories and subcategories in one SQL query and create menu in similar way to How do I create a nested list inside of a while loop?

Edit:

I don't give you full code but most of it.

Because you have code in two files I split my code into two parts - getting data and printing data

global_header.php (getting data)

function get_categories_by_parent($parent_id) 
{
    global $db;

    return $db->query(
                "SELECT category_id, items_counter, hover_title, image_path ".
                "FROM ".DB_PREFIX."categories ".
                "WHERE parent_id=".$parent_id." AND hidden=0 AND user_id=0 AND enable_auctions=1 ".
                "ORDER BY order_id ASC, name ASC"
            );
}

$categories = get_categories_by_parent(0);

$menu_multiarray = array();
$i = 0;

while ($main_category = $db->fetch_array($categories)) 
{
    $menu_multiarray[$i] = array();
    $menu_multiarray[$i]['category'] = $main_category;
    $menu_multiarray[$i]['subcategories'] = array();

    $subcategories = get_categories_by_parent($main_category['category_id']);

    while ($sub_category = $db->fetch_array($subcategories)) 
    {
        $menu_multiarray[$i]['subcategories'][] = $sub_category;
    }   

    $i++;
}

$template->set('menu_multiarray', $menu_multiarray);

categories_box.tpl.php (printing data)

foreach($menu_multiarray as $main_category) 
{
    // print main category using 
    // $main_category['category']['category_id']
    // $main_category['category']['items_counter']
    // $main_category['category']['hover_title']
    // $main_category['category']['image_path']

    $limit = 10;

    foreach($main_category['subcategories'] as $sub_category) 
    {
        // print sub category using 
        // $sub_category['category_id']
        // $sub_category['items_counter']
        // $sub_category['hover_title']
        // $sub_category['image_path']

        $limit--;
        if( $limit == 0 ) break; 
    }

    if( $limit > 0 ) echo "link to rest of subcategorie";
}

Of course I didn't test the code but it show you which way to go.

how to list sub categories?

Answers (2)

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