一个不错的WordPress评论算术题验证码插件

if(!class_exists('comment_capatcha')) {
class comment_capatcha {
function __construct() {
add_action('comment_form', array(& $this, 'print_capatcha'));
add_filter('preprocess_comment', array(& $this, 'preprocess_comment'));
}
function print_capatcha() {
if(!is_user_logged_in()) {
global $post;
session_start();
$rand_1 = mt_rand(1,20);
$rand_2 = mt_rand(1,20);
$_SESSION['capatcha_'.$post->ID] = $rand_1 + $rand_2;

$str = '

echo $str;-
}
}
function preprocess_comment($commentdata) {
if(!is_user_logged_in()) {
session_start();
$post_id = isset($_POST['comment_post_ID']) ? $_POST['comment_post_ID'] : 0;
if(!$post_id){
wp_die('警告：数据来源非法！！');
}
$capatcha = $_SESSION['capatcha_'.$post_id];
if($capatcha != $_POST['capatcha']){
wp_die( __('警告：你智商有问题，不允许评论，请返回重新计算。') );
}
unset($_SESSION['capatcha_'.$post_id]);
}
return $commentdata;
}
}

}

if( !isset($comment_capatcha) ) {
$comment_capatcha =& new comment_capatcha();
}