<?php

// create bullet-proof excerpt for meta name="description"

function thematic_trim_excerpt($text) {

	if ( '' == $text ) {

		$text = get_the_content('');

		$text = strip_shortcodes( $text );

		$text = str_replace(']]>', ']]>', $text);

		$text = strip_tags($text);

	  $text = str_replace('"', '\'', $text);

		$excerpt_length = apply_filters('excerpt_length', 55);

		$words = explode(' ', $text, $excerpt_length + 1);

		if (count($words) > $excerpt_length) {

			array_pop($words);

			array_push($words, '[...]');

			$text = implode(' ', $words);

		}

	}

	return $text;

}

function thematic_the_excerpt($deprecated = '') {

	global $post;

	$output = '';

	$output = strip_tags($post->post_excerpt);

	$output = str_replace('"', '\'', $output);

	if ( post_password_required($post) ) {

		$output = __('There is no excerpt because this is a protected post.');

		return $output;

	}

	return $output;

}

function thematic_excerpt_rss() {

	global $post;

	$output = '';

	$output = strip_tags($post->post_excerpt);

	if ( post_password_required($post) ) {

		$output = __('There is no excerpt because this is a protected post.');

		return $output;

}

	return apply_filters('thematic_excerpt_rss', $output);

}

add_filter('thematic_excerpt_rss', 'thematic_trim_excerpt');

// create nice multi_tag_title

// Credits: Martin Kopischke for providing this code

function thematic_tag_query() {

	$nice_tag_query = get_query_var('tag'); // tags in current query

	$nice_tag_query = str_replace(' ', '+', $nice_tag_query); // get_query_var returns ' ' for AND, replace by +

	$tag_slugs = preg_split('%[,+]%', $nice_tag_query, -1, PREG_SPLIT_NO_EMPTY); // create array of tag slugs

	$tag_ops = preg_split('%[^,+]*%', $nice_tag_query, -1, PREG_SPLIT_NO_EMPTY); // create array of operators

	$tag_ops_counter = 0;

	$nice_tag_query = '';

	foreach ($tag_slugs as $tag_slug) { 

		$tag = get_term_by('slug', $tag_slug ,'post_tag');

		// prettify tag operator, if any

		if ($tag_ops[$tag_ops_counter] == ',') {

			$tag_ops[$tag_ops_counter] = ', ';

		} elseif ($tag_ops[$tag_ops_counter] == '+') {

			$tag_ops[$tag_ops_counter] = ' + ';

		}

		// concatenate display name and prettified operators

		$nice_tag_query = $nice_tag_query.$tag->name.$tag_ops[$tag_ops_counter];

		$tag_ops_counter += 1;

	}

	 return $nice_tag_query;

}

?>