Better SEO wp_title()

functions.php

# Rewrite <title> tag for better SEO
function seo_title() {
	global $post, $page, $paged;
	$sep = " | "; # Separator
	$newtitle = get_bloginfo('name'); # Default
	
	# Single page ########################################
	if (is_single() || is_page()) {
		$newtitle = single_post_title("", false); # default title 
	}
		
			
	# Category ########################################
	if (is_category())
		$newtitle = single_cat_title("", false);

	# Tag ########################################
	if (is_tag())
	 $newtitle = single_tag_title("", false);
	
	# Search results ########################################
	if (is_search())
	 $newtitle = "Результаты поиска: " . $s;
	
	# Taxonomy page ########################################
	if (is_tax()) { 
		$curr_tax = get_taxonomy(get_query_var('taxonomy'));
		$curr_term = get_term_by('slug', get_query_var('term'), get_query_var('taxonomy')); # current term data
		# if it's term 
		if (!empty($curr_term)) {
			$newtitle = $curr_tax->label . $sep . $curr_term->name;
		} else {
			$newtitle = $curr_tax->label;
		}
	}

	# Add page number if necesary
	if ($paged >= 2 || $page >= 2)
			$newtitle .= $sep . sprintf('Страница %s', max($paged, $page));
			
	# Home & Front Page ########################################	
	if (is_home() || is_front_page()) {
		$newtitle = get_bloginfo('name') . $sep . get_bloginfo('description');
	} else {
		$newtitle .= " | " . get_bloginfo('name');
	}
	
	return $newtitle;
}
add_filter('wp_title', 'seo_title');