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I'm trying to build an automated mega menu that loops through all product-category terms and displays them in a hierarchical underscored list, as well as including post in each term.

For example, let's say these are my terms:

  • Utensils
    • Paints
    • Crayons
    • Markers
  • Canvases
    • Cloth
      • Canvas
      • Felt
    • Paper

And any of those terms could have posts associated with them. I need to display the terms in that same order, with their posts listed as children of the relevant term. So, it would end up looking something like this:

  • Utensils (product-category)
    • Paints (product-category)
      • Oil Paints (product)
      • Acrylic Paints (product)
    • Crayons (product-category)
      • Crayola (product)
    • Markers (product-category)
      • Crayola (product)
      • Sharpie (product)
  • Canvases (product-category)
    • Awesome Canvas™ (product)
    • Cloth (product-category)
      • Canvas (product-category)
        • Flexible (product)
      • Felt (product-category)
    • Paper (product-category)

(I'm bad at making examples)

Now, I can loop through the top level terms, but I'm having a hard time making a while loop that goes all the way down until the next term has no children.

Here's what I have so far:

$terms = get_terms("product-category", array(
    "parent" => 0,
));

if ($terms) {
    $output = "<ul class='menu-list sub-menu'>";

    foreach ($terms as $term) {

        $output .= "<li class='menu-item'>";

        $output .= "<a href='#'>\$term = {$term->name}</a>";

        /*
         * Here's where things get weird. I need to figure out a way to
         * loop through all child categories and dislpay them in an
         * unordered list, while also including their own child posts.
         */

        $output .= "</li>";
    }

    $output .= "</ul>";
}

I've scrapped it several times and started over. I'll keep updating this as I make progress.


Edit 1: The goal is to essentially combine something like wp_list_categories with the categories posts.


Edit 2: New idea is to abstract the function to get children in to it's own function. Trying this now...

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