tagging_functions.php

<?php
function product_tag_init(){
	$taxonomy = 'product_tag';
	$obj_type = 'product';
	if(function_exists('register_taxonomy')) {
		register_taxonomy( $taxonomy, $obj_type);
	}
	//wp_set_object_terms(8, 'pen', 'product_tag');
}

function product_tag_cloud(){
	product_tag_init();
	$defaults = array(
		'smallest' => 8, 'largest' => 22, 'unit' => 'pt', 'number' => 45,
		'format' => 'flat', 'orderby' => 'name', 'order' => 'ASC',
		'exclude' => '', 'include' => ''
	);
	$args = wp_parse_args( $args, $defaults );

	$tags = get_product_tags( array_merge($args, array('orderby' => 'count', 'order' => 'DESC')) ); // Always query top tags
	//var_dump($tags);

	if ( empty($tags) )
		return;

	$return = wp_generate_product_tag_cloud( $tags, $args ); // Here's where those top tags get sorted according to $args
	if ( is_wp_error( $return ) )
		return false;
	else 
		echo apply_filters( 'product_tag_cloud', $return, $args );
}

function wp_generate_product_tag_cloud( $tags, $args = '' ) {
	global $wp_rewrite;
	$defaults = array(
		'smallest' => 8, 'largest' => 22, 'unit' => 'pt', 'number' => 45,
		'format' => 'flat', 'orderby' => 'name', 'order' => 'ASC'
	);
	$args = wp_parse_args( $args, $defaults );
	extract($args);

	if ( !$tags )
		return;
	$counts = $tag_links = array();
	foreach ( (array) $tags as $tag ) {
		$counts[$tag->name] = $tag->count;
		$tag_links[$tag->name] = get_product_tag_link( $tag->term_id );
		if ( is_wp_error( $tag_links[$tag->name] ) )
			return $tag_links[$tag->name];
		$tag_ids[$tag->name] = $tag->term_id;
	}

	$min_count = min($counts);
	$spread = max($counts) - $min_count;
	if ( $spread <= 0 )
		$spread = 1;
	$font_spread = $largest - $smallest;
	if ( $font_spread <= 0 )
		$font_spread = 1;
	$font_step = $font_spread / $spread;

	// SQL cannot save you; this is a second (potentially different) sort on a subset of data.
	if ( 'name' == $orderby )
		uksort($counts, 'strnatcasecmp');
	else
		asort($counts);

	if ( 'DESC' == $order )
		$counts = array_reverse( $counts, true );

	$a = array();

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

	foreach ( $counts as $tag => $count ) {
		$tag_id = $tag_ids[$tag];
		$tag_link = clean_url($tag_links[$tag]);
		$tag = str_replace(' ', '&nbsp;', wp_specialchars( $tag ));
		$a[] = "<a href='$tag_link' class='tag-link-$tag_id' title='" . attribute_escape( sprintf( __('%d topics'), $count ) ) . "'$rel style='font-size: " .
			( $smallest + ( ( $count - $min_count ) * $font_step ) )
			. "$unit;'>$tag</a>";
	}

	switch ( $format ) :
	case 'array' :
		$return =& $a;
		break;
	case 'list' :
		$return = "<ul class='product_tag_cloud'>\n\t<li>";
		$return .= join("</li>\n\t<li>", $a);
		$return .= "</li>\n</ul>\n";
		break;
	default :
		$return = join("\n", $a);
		break;
	endswitch;

	return apply_filters( 'wp_generate_product_tag_cloud', $return, $tags, $args );
}

function &get_product_tags($args = '') {
	global $wpdb, $category_links;
	$key = md5( serialize( $args ) );
	if ( $cache = wp_cache_get( 'get_product_tags', 'category' ) )
		if ( isset( $cache[ $key ] ) )
			return apply_filters('get_product_tags', $cache[$key], $args);


	$tags = get_terms('product_tag', $args);

	if ( empty($tags) )
		return array();

	$cache[ $key ] = $tags;
	wp_cache_set( 'get_product_tags', $cache, 'category' );

	$tags = apply_filters('get_product_tags', $tags, $args);
	return $tags;
}

function &get_product_tag($tag, $output = OBJECT, $filter = 'raw') {
	return get_term($tag, 'product_tag', $output, $filter);
}
//
// Tags
//

function get_product_tag_link( $tag_id ) {
	global $wp_rewrite;
	$taglink = $wp_rewrite->get_tag_permastruct();

	$tag = &get_term($tag_id, 'product_tag');
	
	
	if ( is_wp_error( $tag ) )
		return $tag;
	$slug = $tag->slug;
	if ( empty($taglink) ) {
		
		$file = get_option('home') . '/';
		$taglink = $file . '?page_id=3&ptag=' . $slug;
	} else {
	
		$file = get_option('home') . '/';
		$taglink = get_option('product_list_url') . '?ptag=' . $slug;
/*	
	  $taglink = get_option('product_list_url')."tag/%tag%";
		$taglink = str_replace('%tag%', $slug, $taglink);
		$taglink = user_trailingslashit($taglink, 'category');*/
	}
	return apply_filters('product_tag_link', $taglink, $tag_id);
}

function get_the_product_tags( $id = 0 ) {
	global $post;

 	$id = (int) $id;

	if ( ! $id && ! in_the_loop() )
		return false; // in-the-loop function

	if ( !$id )
		$id = (int) $post->ID;

	$tags = get_object_term_cache($id, 'product_tag');
	if ( false === $tags )
		$tags = wp_get_object_terms($id, 'product_tag');

	$tags = apply_filters( 'get_the_tags', $tags );
	if ( empty( $tags ) )
		return false;
	return $tags;
}

function get_the_product_tag_list( $before = '', $sep = '', $after = '' ) {
	$tags = get_the_tags();

	if ( empty( $tags ) )
		return false;

	$tag_list = $before;
	foreach ( $tags as $tag ) {
		$link = get_tag_link($tag->term_id);
		if ( is_wp_error( $link ) )
			return $link;
		$tag_links[] = '<a href="' . $link . '" rel="tag">' . $tag->name . '</a>';
	}

	$tag_links = join( $sep, $tag_links );
	$tag_links = apply_filters( 'the_tags', $tag_links );
	$tag_list .= $tag_links;

	$tag_list .= $after;

	return $tag_list;
}

function the_product_tags( $before = 'Tags: ', $sep = ', ', $after = '' ) {
	$return = get_the_product_tag_list($before, $sep, $after);
	if ( is_wp_error( $return ) )
		return false;
	else
		echo $return;
}
?>