get_the_category_list

Source code

function get_the_category_list( $separator = '', $parents='', $post_id = false ) {

	global $wp_rewrite;

	$categories = get_the_category( $post_id );

	if ( !is_object_in_taxonomy( get_post_type( $post_id ), 'category' ) )

		return apply_filters( 'the_category', '', $separator, $parents );



	if ( empty( $categories ) )

		return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents );



	$rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"';



	$thelist = '';

	if ( '' == $separator ) {

		$thelist .= '<ul class="post-categories">';

		foreach ( $categories as $category ) {

			$thelist .= "\n\t<li>";

			switch ( strtolower( $parents ) ) {

				case 'multiple':

					if ( $category->parent )

						$thelist .= get_category_parents( $category->parent, true, $separator );

					$thelist .= '<a href="' . get_category_link( $category->term_id ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';

					break;

				case 'single':

					$thelist .= '<a href="' . get_category_link( $category->term_id ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>';

					if ( $category->parent )

						$thelist .= get_category_parents( $category->parent, false, $separator );

					$thelist .= $category->name.'</a></li>';

					break;

				case '':

				default:

					$thelist .= '<a href="' . get_category_link( $category->term_id ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';

			}

		}

		$thelist .= '</ul>';

	} else {

		$i = 0;

		foreach ( $categories as $category ) {

			if ( 0 < $i )

				$thelist .= $separator;

			switch ( strtolower( $parents ) ) {

				case 'multiple':

					if ( $category->parent )

						$thelist .= get_category_parents( $category->parent, true, $separator );

					$thelist .= '<a href="' . get_category_link( $category->term_id ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a>';

					break;

				case 'single':

					$thelist .= '<a href="' . get_category_link( $category->term_id ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>';

					if ( $category->parent )

						$thelist .= get_category_parents( $category->parent, false, $separator );

					$thelist .= "$category->name</a>";

					break;

				case '':

				default:

					$thelist .= '<a href="' . get_category_link( $category->term_id ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a>';

			}

			++$i;

		}

	}

	return apply_filters( 'the_category', $thelist, $separator, $parents );

}