<?php
/*Encoding UTF-8*/
/* The mandatory meta:
Plugin Name: Just one cyr
Plugin URI: http://blog.peio.org/?p=643
Description: Requires at least one cyrilic symbol in the comment and no russian letters.
Version: 0.3 works for me
Author: Peio Popov <peio@peio.org>
Author URI: http://blog.peio.org/
*/

function just_one_cyr ( $comment ) {
  if ( preg_match("/а|е|о|у|ю|я|и|ъ/i", $comment) and !preg_match("/ы|ё|э/i", $comment)  ) {
    return  $comment;
  }
  else {  	
    wp_die('Моля, използвайте кирилица за вашите коментари!');  
  }
}

function verify_id( $comment ) {
	global $wpdb, $tableposts, $comment_post_ID;

	if ( 'open' ==  $wpdb->get_var("SELECT comment_status FROM $tableposts WHERE ID = '$comment_post_ID'") ) {
		return $comment;
	}	
	else {
		wp_die('капут геворден');
	}	
}

add_filter('pre_comment_content', 'just_one_cyr');
add_filter('post_comment_text', 'verify_id');
?>