<?php

class mfValuecache {
  public static $instance;
  public $cache = [];
  
  
  private function __construct() {
		
	}
	
	public static function singleton() {
		if(!isset(self::$instance)) {
			$c=__CLASS__;
			self::$instance=new $c();
		}
		return self::$instance;
	}
  
  public static function get($key) {
    $instance = self::singleton();
    if(array_key_exists($key, $instance->cache)) {
      return $instance->cache[$key];
    }
    return null;
  }
  
  public static function set($key, $value) {
    $instance = self::singleton();
    $instance->cache[$key] = $value;
  }
}