WordPress, retrieve the amount of comments a post has with russian plural form.

russian_comments_number.php

<?php

/**
 * Retrieve the amount of comments a post has with russian plural form.
 *
 * @uses apply_filters() Calls the 'get_comments_number' hook on the number of comments
 *
 * @param int $post_id The Post ID
 * @return int The number of comments a post has
 */
function russian_comments_number($zero = false, $one = false, $more = false, $deprecated = '') {
	global $id;
	$number = get_comments_number($id);
	
	if ($number == 0) {
		$output = 'Нет комментариев';
	} elseif ($number == 1) {
		$output = '1 комментарий';
	} elseif (($number > 20) && (($number % 10) == 1)) {
		$output = str_replace('%', $number, '% комментарий');
	} elseif ((($number >= 2) && ($number <= 4)) || ((($number % 10) >= 2) && (($number % 10) <= 4)) && ($number > 20)) {
		$output = str_replace('%', $number, '% комментария');
	} else {
		$output = str_replace('%', $number, '% комментариев');
	}
	echo apply_filters('russian_comments_number', $output, $number);
}

add_filter('comments_number', 'russian_comments_number');

?>