Re: Function caching...

Ulf Wendel wrote: > > I know sites who use wget to get a static version to serve the internet. > > The php site is only used for easy editing > > With cached functions calls you could define a cache lifetime which > allows you to automatically generate a "new version" every n seconds > without the need of an external tool. Actually, it is even more comfortable, as the cache is keyed by the function name and parameters (using in our prototypes a md5 hash of the function name and the serialized parameters as a key). That is, as soon as you call your function with new parameters, it will generate a new hash key and new output. You need to manually flush the cache as soon as you change any aspect of the function that is not covered by the hash key, such as values in a database that are not reflected by a change in the parameters (i.e. you UPDATE values instead of INSERTing them and call the function with the new id). You also need to flush the cache as soon as you change the code of the function in a way that affects the function result or output. You do not really need lifetimes in the cache, as your functions have to be side-effect free and idempotent to be cacheable. You could use lifetimes as a safeguard (automatisch cache flush) against bad code or practice, but they are not critical. Kristian -- Kristian Köhntopp, NetUSE AG Siemenswall, D-24107 Kiel Tel: +49 431 386 436 00, Fax: +49 431 386 435 99 Using PHP3? See our web development library at http://phplib.netuse.de/