internal_suggestions()

        public function internal_suggestions(){
            if ( is_404() ){
                $this->timer('Internal Suggestions');
                $this->ga_send_exception('(PHP) 404 Error for requested URL: ' . $this->url_components()); //Track 404 error pages as exceptions in Google Analytics

                $this->slug_keywords = array_filter(explode('/', $this->url_components('filepath'))); //Convert the requested filepath into an array (ignore query strings and remove empty items)
                $this->slug_keywords = end($this->slug_keywords); //Get the last "directory" from the path (this was the requested "term" we will search for)

                if ( !empty($this->slug_keywords) ){
                    //Query the DB with clues from the requested URL
                    $this->error_query = new WP_Query(array('post_status' => 'publish', 'posts_per_page' => 4, 's' => str_replace('-', ' ', $this->slug_keywords))); //Query the DB for this term
                    if ( function_exists('relevanssi_do_query') ){
                        relevanssi_do_query($this->error_query);
                    }

                    //Check for an exact match
                    if ( !empty($this->error_query->posts) && $this->slug_keywords === $this->error_query->posts[0]->post_name ){
                        $this->error_404_exact_match = $this->error_query->posts[0];
                    }
                }

                $this->timer('Internal Suggestions', 'end');
            }
        }