gistfile1.aw

/**
 * function to implement [pmc_post_top_tag_names] shortcode to fetch top N tag names for a post
 */
public function post_top_tag_names($attrs) {
	extract(shortcode_atts(array(
		'post' => 0,
		'count' => 3,
		'tags' => 'strong,em'
	 ), $attrs));
	$_tags_enum = array('strong', 'em', 'b', 'i');		//html tag whitelist
	$post = intval($post);
	$count = intval($count);
	$tags = trim(strip_tags($tags));		//lets strip out any HTML/PHP tags in there
	$tags = str_replace('"', '', str_replace("'", '', $tags));	//replace any quotes etc
	if( empty($tags) ) {
		return '';
	}
	
	$top_tags = $this->_get_post_top_tag_names($post, $count);
	if( ! is_array($top_tags) ) {
		$top_tags = explode(', ', $this->_defaults['pmc_post_top_tag_names']['tags']);
	}

	$tags = explode(',', $tags);
	foreach( $top_tags as $key => $value ) {
		foreach( $tags as $tag ) {
			$tag = trim($tag);
			if( ! in_array($tag, $_tags_enum) ) {
				continue;	//if HTML tag is not in whitelist then we don't apply it
			}
			$top_tags[$key] = '<' . $tag . '>' . esc_html($value) . '</' . $tag . '>';
		}
	}

	//if there are just two tag names then use "and" between them else make them comma separated
	$top_tags_str = ( count($top_tags) == 2 ) ? implode(' and ', $top_tags) : implode(', ', $top_tags);
	unset($post, $count, $tags, $top_tags);
	return $top_tags_str;
}