This version allows the use of alternative RequestMethods in case get_file_contents() is disabled for security reasons. Currently it uses fsockopen() but it can also use php-curl. Include inc/recaptchalib.php into the file where the reCaptcha is shown or validated. The function boinc_recaptcha_isValidated() is a convenient wrapper that can be updated for future versions or changes of the RequestMethod used.
Christian Beer