WordPress <Title> with categorys and tags

gistfile1.aw

<?php
<title><?php
        // Logic of printing the <title> tag 
        global $page, $paged;
        echo trim(wp_title( '', false, 'right' ));
		global $post;

		$post_tags = wp_get_post_tags($post->ID); 
		$numItems = count($post_tags);
		$i = 0;
		if ( !is_home() ){
		foreach ($post_tags as $post_tag) { 
			if($i == 0){
				echo '-'.$post_tag->name;
			}
			elseif ($i+1 == $numItems){
				echo $post_tag->name;
			}
			else{
				echo $post_tag->name.",";
			}
				$i++;
 			}

		$post_cates = wp_get_post_categories($post->ID); 
		$cats = array();
		
		foreach ($post_cates as $c) { 
				$cat = get_category( $c,false);
				echo '-'.$cat->name;
				}
			}	
        if ( !is_home() ) echo " | ";
			bloginfo( 'name' );
        // Add the blog description only for home.
        $site_description = get_bloginfo( 'description', 'display' );
        if ( $site_description && is_home() && !$paged )
            echo " | $site_description";
        // Paged format
        if ( $paged >= 2 || $page >= 2 )
			echo ' - ' . sprintf( __( 'Page %s', 'dot-b' ), max( $paged, $page ) );
        ?></title>
?>