Caching REST response about php-restclient HOT 1 CLOSED

<?php

define('CACHE_EXT', ".phpc");
define('CACHE_PATH', realpath("cache").'/');
define('CACHE_PERMISSIONS', 0766);


class Cache {

    public $key;
    public $data = NULL;

    public static function set_permissions(){
        if(substr(decoct(fileperms(CACHE_PATH)), 1) !== CACHE_PERMISSIONS)
            @chmod(CACHE_PATH, CACHE_PERMISSIONS);
    }

    public function __construct($key){
        $this->key = $key;
    }

    public function filename(){
        return CACHE_PATH . $this->key . CACHE_EXT;
    }

    public function get(){
        return ($this->data)? $this->data : $this->read_data();
    }

    public function read_data(){
        if(!$this->exists())
            return FALSE;
        $this->data = unserialize(file_get_contents($this->filename()));
        return $this->data;
    }

    public function put($data){
        $this->data = $data;
        return $this->write_data();
    }

    public function write_data(){
        if($file = fopen($this->filename(), 'w+')){
            fwrite($file, serialize($this->data));
            fclose($file);
            return TRUE;
        }
        return FALSE;
    }

    public function exists(){
        return file_exists($this->filename());
    }

    public function age(){
        return $this->exists()? (time() - filemtime($this->filename())) : NULL;
    }
}

define('CACHE_AGE', 360);

$api = new RestClient;
$cache = new Cache('__default__');

if($cache->age() > CACHE_AGE){
    $posts = $api->get('posts');
    $cache->put($posts);
}
else {
    $posts = $cache->get();
}