recaptcha验证不会与codeigniter一起抛出-但仅当上载到webhost时

使用以下联机指南(以及底部的1.7x修复程序) http://codeigniter.com/forums/viewthread/94299/

Recaptcha验证在本地工作时(在我的windows计算机和朋友的OSX计算机上都进行了测试)效果很好,但是在上载我的服务器和他的web主机时,即使页面上的其他验证也不会检查recaptch的验证例程。但是没有抛出任何错误,我已经查看了代码,无法找出出了什么问题。如果有人能帮我弄清楚发生了什么,我将不胜感激。

以下是处理这个问题的类

应用程序/库/MY_Form_Validation.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class MY_Form_Validation extends CI_Form_Validation
{

    function MY_Form_Validation()
    {
        parent::CI_Form_Validation();
    }

    function recaptcha_matches() {
        $CI = & get_instance();
        $CI->config->load('recaptcha');
        $public_key = $CI->config->item('recaptcha_public_key');
        $private_key = $CI->config->item('recaptcha_private_key');
        $response_field = $CI->input->post('recaptcha_response_field');
        $challenge_field = $CI->input->post('recaptcha_challenge_field');
        $response = recaptcha_check_answer($private_key, $_SERVER['REMOTE_ADDR'], $challenge_field, $response_field);

        if ($response->is_valid) {
            return TRUE;
        }
        else {
            $this->recaptcha_error = $response->error;
            $this->set_message('recaptcha_matches', 'The %s is incorrect. Please try again.');
            return FALSE;
        }
    }

应用程序/helpers/recaptcha_helper.php

http://pastebin.com/m352494c3

application/controllers/forum.php-后线程方法

public function add_thread($category_id = null)
{
    $category = $this->forums->get_category($category_id);
    if ($category == false)
    {
        $this->template->set('title', 'Invalid Page');
        $data['error_message'] = "Invalid category to add thread too";
        $this->template->load('template', 'error', $data);
        return;
    }

    $user = $this->users->get($this->session->userdata('user_id'));

    $data['category_id'] = $category['id'];
    $data['category_title'] = $category['category_title'];
    $data['loggedin'] = $this->session->userdata('loggedin');

    $this->form_validation->set_rules('thread_title', 'Title', 'required');
    $this->form_validation->set_rules('thread_body', 'Body', 'required');

    if (!$data['loggedin'])
    {
        $this->form_validation->set_rules('recaptcha_challenge_field', 'answer to the security question', 'recaptcha_matches');
    }

    if ($this->form_validation->run() == FALSE)
    {
        $this->template->load('template', 'forums/add_thread', $data);
        return;
    }

    $thread['thread_title'] = $this->input->post('thread_title');
    $thread['thread_body'] = $this->input->post('thread_body');
    if($user==false){
        $thread['user_id'] = -1;
    }else{
        $thread['user_id'] = $user->id;
    }
    $thread['posted_date'] = date("Y-m-d H:i:s");
    $thread['category_id'] = $category_id;

    $this->forums->add_thread($thread);
    redirect('forums/view/' . $category_id, 'refresh');
}