[求助]关于pear mdb5的错误

如题.
请问下以下的错误怎么解决
Deprecated: Assigning the return value of new by reference is deprecated in E:\wamp\bin\php\php5.3.3\PEAR\MDB2.php on line 390
Deprecated: Assigning the return value of new by reference is deprecated in E:\wamp\bin\php\php5.3.3\PEAR\MDB2.php on line 1885
Deprecated: Assigning the return value of new by reference is deprecated in E:\wamp\bin\php\php5.3.3\PEAR\MDB2.php on line 2572
Deprecated: Assigning the return value of new by reference is deprecated in E:\wamp\bin\php\php5.3.3\PEAR\MDB2.php on line 2595
Deprecated: Assigning the return value of new by reference is deprecated in E:\wamp\bin\php\php5.3.3\PEAR\MDB2.php on line 2940