Add Glyphicons to wp_list_categories

Add Twitter Bootstrap Glyphicons to individual list items in wp_list_categories. Do this by modifying the wp_list_categories. Easy peasy by adding a filter. No forsaken Walker needed. My example below adds the ‘icon-book’ glyphicon to each list item generated by wp_list_categories. For all the possible icons you can choose from, see the Twitter Bootstrap stylesheet (bootstrap.css).

* add glyphicons to wp_list_categories 'id="icon-book" 

function isa_add_icons_wp_list_cats($wp_list_categories) {
		$pattern = '/<a/';
		$replacement = '<i class="icon-book"></i><a';
		return preg_replace($pattern, $replacement, $wp_list_categories);

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