How to output categories with custom markup and hierarchy? - php

Question

On this SO question I have found the following
$args = array(
'orderby' => 'name',
'order' => 'ASC',
'number' => 20 // how many categories
);
$categories = get_categories($args);
foreach($categories as $category) {
echo '<li><a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a></li>›';
}
That's a step but that it isn't creating a hierarchy. I have read get categories in wp codex but I couldn't work it out.
My structure is:
CAT 1
cat 1.1
cat 1.2
CAT 2
cat 2.1
cat 2.2
Tried this but the output is simply a list of items with no hierarchy at all:
public function walk_taxonomy( $type = "checkbox", $args = array() ) {
$args['walker'] = new Search_Filter_Taxonomy_Walker($type, $args['name']);
$output = $argo = array(
'hierarchical' => 1
);
$categories = get_categories($argo);
foreach($categories as $category) {
echo '<li><a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a></li>›';
}
if ( $output )
return $output;
}

Answer 1

you have to add this to the args:
'hierarchical' => 1,
in your foreach you have to check if $category->parent is empty or not.. if not empty indent by adding spaces or applying a class to your li like
<li class="indent">