<?php 
    /**
     * Valid Checker: Is Valid Twitter Account
     *
     */
    function isValidTwitter($value, $params = array())
    {
        $curl_twitter = curl_init();
        curl_setopt($curl_twitter, CURLOPT_URL, 'http://twitter.com/account/verify_credentials.json');
        curl_setopt($curl_twitter, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
        curl_setopt($curl_twitter, CURLOPT_HEADER, false);
        curl_setopt($curl_twitter, CURLOPT_USERPWD, $this->data[$this->name]['twitter_username'].":".$this->data[$this->name]['twitter_password']);
        curl_setopt($curl_twitter, CURLOPT_POST, true);
        curl_setopt($curl_twitter, CURLOPT_RETURNTRANSFER, true);
        $curl_result = curl_exec($curl_twitter);
        curl_close($curl_twitter);

        $twitterResponse = json_decode($curl_result, true);
?>