Re: GC auto or not

> 1. wether the garbage collaction is automatic Yes. PHP 4 is more agressive in its timing and can GC an object as soon as its no longer referenced. PHP 3 will not GC some things until the script ends, but will get them all. > 2.or called when page_close is called .? This is from PHPLib? PHPLib's page_close() has little or nothing to do with PHP's GC, except that PHPLib may be maintaining some sort of state of a large number of objects until that's called... > 3.how to set the session time limit and page cache expiry See php.ini for the session time limit. Page caching is controlled by HTTP protocol headers, not PHP. Search the code archives for "cache" and use every cache-related (and time/expiration) header you can find.