register_taxonomy

Source code

function register_taxonomy( $taxonomy, $object_type, $args = array() ) {

	global $wp_taxonomies, $wp_rewrite, $wp;



	if ( ! is_array($wp_taxonomies) )

		$wp_taxonomies = array();



	$defaults = array(	'hierarchical' => false,

						'update_count_callback' => '',

						'rewrite' => true,

						'query_var' => $taxonomy,

						'public' => true,

						'show_ui' => null,

						'show_tagcloud' => null,

						'_builtin' => false,

						'labels' => array(),

						'capabilities' => array(),

						'show_in_nav_menus' => null,

					);

	$args = wp_parse_args($args, $defaults);



	if ( false !== $args['query_var'] && !empty($wp) ) {

		if ( true === $args['query_var'] )

			$args['query_var'] = $taxonomy;

		$args['query_var'] = sanitize_title_with_dashes($args['query_var']);

		$wp->add_query_var($args['query_var']);

	}



	if ( false !== $args['rewrite'] && '' != get_option('permalink_structure') ) {

		$args['rewrite'] = wp_parse_args($args['rewrite'], array(

			'slug' => sanitize_title_with_dashes($taxonomy),

			'with_front' => true,

			'hierarchical' => false

		));



		if ( $args['hierarchical'] && $args['rewrite']['hierarchical'] )

			$tag = '(.+?)';

		else

			$tag = '([^/]+)';



		$wp_rewrite->add_rewrite_tag("%$taxonomy%", $tag, $args['query_var'] ? "{$args['query_var']}=" : "taxonomy=$taxonomy&term=");

		$wp_rewrite->add_permastruct($taxonomy, "{$args['rewrite']['slug']}/%$taxonomy%", $args['rewrite']['with_front']);