is_spam_akismet.php

function is_spam_akismet($args){
	global $akismet_api_host, $akismet_api_port;
	
	$query['user_ip'] 		= preg_replace( '/[^0-9., ]/', '', $_SERVER['REMOTE_ADDR'] );
	$query['user_agent'] 	= (isset( $_SERVER['HTTP_USER_AGENT'] )) ? $_SERVER['HTTP_USER_AGENT'] : '';
	$query['referrer'] 		= (isset( $_SERVER['HTTP_REFERER'] )) ? $_SERVER['HTTP_REFERER'] : '';
	$query['blog'] 			= get_option( 'home' );
	$query['blog_lang'] 	= get_locale(); // default 'en_US'
	$query['blog_charset'] 	= get_option( 'blog_charset' );
	$query['comment_type'] 	= 'forum-post'; //For more info http://bit.ly/2bVOMay
	
	$query['comment_content'] = $args["post_content"];
	$query['permalink'] 	= $args['referrer'];
	$query['comment_author'] = $args["user_name"];
	$query['comment_author_email'] = $args["user_email"];

	//$query['is_test']  = "1";  // uncomment this when testing spam detection
	//$query['comment_author']  = "viagra-test-123";  // uncomment this to test spam detection

	$query_string = http_build_query($query);
	
	$spam = false;
	if ( is_callable( array( 'Akismet', 'http_post' ) ) ) { //Akismet v3.0+
		$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 );
	}
	if ( 'true' == $response[1] ) {
		$spam = true;
	}

	return $spam;
}