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Edit File: class.akismet.php

<?php
/**
 * @package mw-wp-form
 * @author websoudan
 * @license GPL-2.0+
 */

/**
 * MW_WP_Form_Akismet
 */
class MW_WP_Form_Akismet {

/**
	 * Return akismet api key when akismet is active
	 *
	 * @return string API Key
	 */
	private function _is_enable() {
		if ( is_callable( array( 'Akismet', 'get_api_key' ) ) ) {
			return Akismet::get_api_key();
		}

if ( function_exists( 'akismet_get_key' ) ) {
			return akismet_get_key();
		}

return false;
	}

/**
	 * Return true when through akismet check.
	 *
	 * @param string          $akismet_author       Akismet author.
	 * @param string          $akismet_author_email Akismet author e-mail.
	 * @param string          $akismet_author_url   Akismet author url.
	 * @param MW_WP_Form_Data $Data MW_WP_Form_Data object.
	 * @return bool
	 */
	public function is_valid( $akismet_author, $akismet_author_email, $akismet_author_url, $Data ) {
		global $akismet_api_host, $akismet_api_port;

if ( ! $this->_is_enable() ) {
			return false;
		}

$doAkismet = false;

$author = '';
		if ( $Data->get_post_value_by_key( $akismet_author ) ) {
			$author    = $Data->get_post_value_by_key( $akismet_author );
			$doAkismet = true;
		}

$author_email = '';
		if ( $Data->get_post_value_by_key( $akismet_author_email ) ) {
			$author_email = $Data->get_post_value_by_key( $akismet_author_email );
			$doAkismet    = true;
		}

$author_url = '';
		if ( $Data->get_post_value_by_key( $akismet_author_url ) ) {
			$author_url = $Data->get_post_value_by_key( $akismet_author_url );
			$doAkismet  = true;
		}

if ( ! $doAkismet ) {
			return false;
		}

$content = '';
		foreach ( $Data->gets() as $key => $value ) {
			$value    = $Data->get( $key );
			$content .= $value . "\n\n";
		}

$permalink = get_permalink();
		$akismet   = array();

$akismet['blog']         = home_url();
		$akismet['blog_lang']    = get_locale();
		$akismet['blog_charset'] = get_option( 'blog_charset' );
		$akismet['user_ip']      = preg_replace( '/[^0-9., ]/', '', $_SERVER['REMOTE_ADDR'] );
		$akismet['user_agent']   = $_SERVER['HTTP_USER_AGENT'];
		$akismet['referrer']     = $_SERVER['HTTP_REFERER'];
		$akismet['comment_type'] = MWF_Config::NAME;

if ( $permalink ) {
			$akismet['permalink'] = $permalink;
		}
		if ( $author ) {
			$akismet['comment_author'] = $author;
		}
		if ( $author_email ) {
			$akismet['comment_author_email'] = $author_email;
		}
		if ( $author_url ) {
			$akismet['comment_author_url'] = $author_url;
		}
		if ( $content ) {
			$akismet['comment_content'] = $content;
		}

foreach ( $_SERVER as $key => $value ) {
			if ( in_array( $key, array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' ), true ) ) {
				continue;
			}
			$akismet[ $key ] = $value;
		}

$query_string = http_build_query( $akismet, null, '&' );
		if ( is_callable( array( 'Akismet', 'http_post' ) ) ) {
			$response = Akismet::http_post( $query_string, 'comment-check' );
		} else {
			$response = akismet_http_post(
				$query_string,
				$akismet_api_host,
				'/1.1/comment-check',
				$akismet_api_port
			);
		}
		$response = apply_filters( 'mwform_akismet_responce', $response );
		return ( 'true' === $response[1] ) ? true : false;
	}
}