reCAPTCHA::verify_response_input( string $response )

	protected function verify_response_input( $response ) {
		$peer_key = version_compare( phpversion(), '5.6.0', '<' ) ? 'CN_name' : 'peer_name';

		$options = array(
			'http'			=> array(
				'header'		=> "Content-type: application/x-www-form-urlencoded\r\n",
				'method'		=> 'POST',
				'content'		=> http_build_query( array(
					'secret'		=> $this->get_option( 'secret_key' ),
					'response'		=> $response,
				), '', '&' ),
				'verify_peer'	=> true,
				$peer_key		=> 'www.google.com',
			),
		);

		$context = stream_context_create( $options );

		return file_get_contents( 'https://www.google.com/recaptcha/api/siteverify', false, $context );
	}