public function isHTML($isHtml = true)
    {
        if ($isHtml) {
            $this->ContentType = static::CONTENT_TYPE_TEXT_HTML;
        } else {
            $this->ContentType = static::CONTENT_TYPE_PLAINTEXT;
        }
    }
public function isHTML($isHtml = true)
    {
        if ($isHtml) {
            $this->ContentType = static::CONTENT_TYPE_TEXT_HTML;
        } else {
            $this->ContentType = static::CONTENT_TYPE_PLAINTEXT;
        }
    }
public function isHTML ( $ isHtml = true ) { if ( $ isHtml ) { $ this -> ContentType = static :: CONTENT_TYPE_TEXT_HTML ; } else { $ this -> ContentType = static :: CONTENT_TYPE_PLAINTEXT ; } }
Sets message type to HTML or plain.

@param bool $isHtml True for HTML mode
Sets message type to HTML or plain .