railpage/railpagecore

<?php
    /**
     * News classes
     * @since Version 3.0.1
     * @version 3.3
     * @author Michael Greenhill
     * @package Railpage
     * @copyright Copyright (c) 2012 Michael Greenhill
     */
     
    namespace Railpage\News;
    
    use DateTime;
    use Exception;
    use Railpage\AppCore;
        
    /**
     * Find a news article from its URL slug
     * @since Version 3.7.5
     */
    
    class ArticleFromSlug extends Article {
        
        /**
         * Constructor
         * @param string $slug
         */
        
        public function __construct($slug) {
            
            $Database = AppCore::GetDatabase(); 
            $Cache = AppCore::GetMemcached(); 
            
            $mckey = "railpage:news.article_slug=" . $slug;
            
            $loaded = false;
            
            if ($story_id = $Cache->fetch($mckey)) {
                try {
                    parent::__construct($story_id);
                    $loaded = true;
                } catch (Exception $e) {
                    
                }
            }
            
            /**
             * Fall back to a database query if we can't load the news article from Memcached
             */
            
            if (!$loaded) {
                $story_id = $Database->fetchOne("SELECT sid FROM nuke_stories WHERE slug = ?", $slug); 
                
                if (filter_var($story_id, FILTER_VALIDATE_INT)) {
                    $Cache->save($mckey, $story_id, strtotime("+6 months"));
                    
                    parent::__construct($story_id); 
                } else {
                    throw new Exception("Could not find a story matching URL slug " . $slug);
                    return false;
                }
            }
        }
    }