memory.php

<?php

class Memory
{
    private static $_instance = null;
    private $_memcached = null;
    private $_status = false;
    private $_defaultExp;
    private $_prefix = "rs";


    private function __construct()
    {
        $memcached = new Memcached;
        $host = '127.0.0.1';
        $port = '11211';


        $isMemcacheAvailable = $memcached->addServer($host,$port);
        if ($isMemcacheAvailable) {
            $this->_status = true;
            $this->_memcached = $memcached;
        }

        $this->_defaultExp = 60*60*24*7;
    }

    public static function getInstance()
    {
        if(!isset(static::$_instance)){
            static::$_instance = new Memory();
        }
        return static::$_instance;
    }

    public function active()
    {
        return $this->_status;
    }

    public function get($key)
    {
        return $this->_memcached->get(str_replace(' ','_',$this->_prefix . '_' . $key));
    }
    public function forget($key)
    {
        return $this->_memcached->delete(str_replace(' ','_',$this->_prefix . '_' . $key));
    }
    public function set($key,$value,$expiration = null)
    {
        $this->_memcached->set(str_replace(' ','_',$this->_prefix . '_' . $key),$value,$expiration);
    }
    public function error()
    {
        return $this->_memcached->getResultCode();
    }
}