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mattvot

Does anyone know how to make a multi-peer PHP array based on WP category heirachy

I need to make a custom nav bar based on categories.

For example:


array->
	4->0
	5->0
	8->array->
			9->0
			6->array->
					1->0
					3->array->
							10->0
			2->0
	3->0

Where the key would be the cat_ID and the value would be either 0, if it has no children, or an array of it's children and so on.
Does this make sense?

Thanks :D

davesgonebananas

You can use a custom walker to achieve this. It's a fairly advanced topic but i'll "walk" you through it :roll:

Start by creating a class for your walker either in functions.php in your theme, or wherever you like. You can use this as a template.

class CategoryNavigationWalker extends Walker {
	var $db_fields = array('parent' => 'parent', 'id' => 'term_id');
	
	function start_lvl(&$output, $depth) {
		$output .= \"<ul>\n\";
	}
	
	function end_lvl(&$output, $depth) {
		$output .= \"</ul>\n\";
	}
	
	function start_el(&$output, $category, $depth, $args = null) {
		$output .= \"<li>{$category->name}\";
	}
	
	function end_el(&$output, $category, $depth, $args = null) {
		$output .= \"</li>\";
	}
}

This example creates an unordered list, but you can change it to accommodate ordered lists, divs, drop down menus, whatever you fancy. I have just listed the categories but for a navigation you will obviously need to include hyperlinks.

Next a function that uses the walker to produce the navigation menu.

function category_navigation() {
	$walker = new CategoryNavigationWalker(); 
	echo $walker->walk(get_categories(), 0);
}

Finally, when you want to produce the navigation menu in your template use:

<ul><?php category_navigation(); ?></ul>

Hope that is easy to understand and solves your problem.

Dave

treehouse : what would you like to learn today?

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How to make a multi-peer PHP array based on WP cat heirachy?