An Simple Collection Class

/** 
* @copyright    2009-1-16 
* @author Tom Zhou     MSN:danni-505@hotmail.com 
* @Info: Use ArrayObject to build an super simple collection, 
*         it can be used to store various of data, such as DB connection,Object etc.    
*    
* @access anything 
* @return data of corresponding opposite    
*/ 

class MySimpleCollection  extends ArrayObject{ 
   /** 
    * if identity private variable, in construct you should call parent construct and set the 
    * instance to this private variable. 
    * antoher way is never override this construct method 
    */ 
//  private    $collection; 
//  function __construct(){ 
//    parent::__construct(); 
//    $this->collection=$this; 
//  } 
     
  function addObject($_index,$_object){ 
    $ this->offsetSet($_index,$_object); 
  } 
    
  function getObject($_index){ 
     return $ this->offsetGet($_index); 
  } 
    
  function delObject($_index){ 
    $ this->offsetUnset($_index); 
  } 
    
  function printCollection(){ 
    echo  "<pre>"; 
    print_r($ this); 
    echo  "</pre>"; 
  } 
}

MySimpleCollection Object 
( 
        [1] => user Object 
                ( 
                        [no] => 1 
                ) 

        [2] => dbObjMySQL Object 
                ( 
                        [db_host] => 192.168.1.166 
                        [db_name] => LOAN163 
                        [user_name] => root 
                        [pass_code] => 2008like18 
                        [db_connect] => Resource id #22 
                        [db_rec] =>    
                        [ErrMsg] =>    
                        [PHPErrCd] =>    
                        [PHPErrMsg] =>    
                        [PHPSQL] =>    
                        [tran_flg] =>    
                        [new_link] =>    
                ) 

        [3] => /backyard/?Command=Admin_Login 
        [4] => s:6: "daniel"; 
        [5] => daniel 
        [6] => Array 
                ( 
                        [0] => string 
                        [1] => Array 
                                ( 
                                        [name] => daniel 
                                ) 

                        [last name] => zhou 
                ) 

        [7] => Array 
                ( 
                        [0] => daniel 
                ) 

        [8] => 0.2356 
        [9] => daniel 
) 

Object id #6 
1 
Object id #10 
2 
/backyard/?Command=Admin_Login 
3 
s:6: "daniel"; 
4 
daniel 
5 
Array 
6 
Array 
7 
0.2356 
8 
daniel 
9