Zend Studio中PHP扩展的代码完成？

After having installed the HTTP extension from PECL, I expected Zend Studio 6 to recognize the provided HTTP* classes and for code completion to be made available. This is not the case, however. How do I get Zend Studio to recognize classes provided by PHP extensions? Specifcally, I want to be able to use code competition on these classes.After having installed the HTTP extension from