reCaptcha-Controller-3.php

<?php
    function recaptcha_check($response)
    {
        // check to see if the recaptcha is correct
        $resp = recaptcha_check_answer (
                                        $this->_recaptcha_private_key,
                                        $this->input->ip_address(),
                                        $this->input->post('recaptcha_challenge_field'),
                                        $this->input->post('recaptcha_response_field'));
         if(!$resp->is_valid)
         {
             //reCaptcha is wrong
             $this->form_validation->set_message('recaptcha_check', 'reCaptcha was wrong.');
             return FALSE;
         }
         return TRUE;
    } 
?>