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class Multiton
{
  private $instances = array();
 
  public function getInstance($var1, $var2, $var3)
  {
    $uid = md5((string)$var1.(string)$var2.(string)$var3);
    if (!isset(self::$instances[$uid])) 
    { 
      self::$instances[$uid] = new Multiton($var1, $var2, $var3);
    }
    return self::$instances[$uid];
  }
 
}