shortcode list taxonomy terms

list-terms-shortcode.php

<?php
/**
 * Displays a list of terms for a specific taxonomy.
 * Based on Justin Tadlock's [entry-terms] shortcode
 * Added attribute to not link to the taxonomy
 * using wp_get_object_terms() to do so
 *
 * @author Brian Krogsgard
 *
 * @access public
 * @param array $attr
 * @return string
 */
function krogs_taxonomy_list_shortcode( $attr ) {

	$attr = shortcode_atts( array( 'id' => get_the_ID(), 'taxonomy' => 'post_tag', 'separator' => ', ', 'before' => '', 'after' => '', 'link' => false ), $attr );

	$attr['before'] = ( empty( $attr['before'] ) ? '<span class="' . $attr['taxonomy'] . '">' : '<span class="' . $attr['taxonomy'] . '"><span class="before">' . $attr['before'] . '</span>' );
	
	$attr['after'] = ( empty( $attr['after'] ) ? '</span>' : '<span class="after">' . $attr['after'] . '</span></span>' );
	
	$terms = wp_get_object_terms( $attr['id'], $attr['taxonomy']);
	
	$output = '';
	
	if(!empty($terms)){
	
		if(!is_wp_error( $terms )){
		
			$output .= $attr['before'];
			
				$output .= '<ul>';
				
					foreach($terms as $term){
					
						$output .= '<li>';
						
							if ( $attr['link'] ) {
							
								$output .= '<a href="' . get_term_link( $term->slug, $attr['taxonomy'] ) . '">';
								
							}
							
								$output .= $term->name;
							
							if ( $attr['link'] ) {
							
								$output .= '</a>';
								
							}
							
							$output .= $attr['separator'];
						
						$output .= '</li>'; 
					}
					
				$output .= '</ul>';
				
			$output .= $attr['after'];
			
		}
		
	}

	return $output;
}
?>