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<?PHP class CacheLayer{ protected $root = ""; protected $cache = ""; protected $key = ""; protected $life = 0; public function __construct($key,$root = "/cachelayer"){ $this->root = $_SERVER["DOCUMENT_ROOT"].$root; $this->key = $key; } public function expired($life_span){ $this->life = $life_span; $file = $this->root."/".$this->key.".cachelayer"; if(is_file($file)){ $mtime = filemtime($file); return (time() >= ($mtime + $this->life)); }else{ return true; } } public function put($content){ $file = $this->root."/".$this->key.".cachelayer"; if(!is_dir(dirname($this->root))){ return false; } $this->delete(); $content = json_encode($content); return (bool)file_put_contents($file,$content); } public function get(){ $file = $this->root."/".$this->key.".cachelayer"; if(is_file($file)){ return json_decode(file_get_contents($file),true); } return array(); } public function delete(){ $file = $this->root."/".$this->key.".cachelayer"; if(is_file($file)){ unlink($file); return true; } return false; } }
<?PHP // Load the cachelayer and the database connection (db connection is optional) require_once "CacheLayer.PHP"; require_once "db_connection.PHP"; // Create a instance of the cachelayer $cl_nav = new CacheLayer("navigation"); // Check to see if the cache is expired (60 * 10 = 10 minutes) if($cl_nav->expired(60 * 10)){ echo "Cache doesn't exist or is expired. Rebuilding...<br />"; // if the cache is expired rebuild it $result = MysqL_query("select id,title from navigation"); $new_cache = array(); while($row = MysqL_fetch_assoc($result)){ $new_cache[] = $row; } // Save the array into the cache $cl_nav->put($new_cache); } echo "Loading from cache...<br />"; // Get the cache $cache = $cl_nav->get(); // display the cache foreach($cache as $row){ $id = $row["id"]; $title = $row["title"]; echo "<a href='/$id/$title'>$title</a><br />"; }
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