Hi,
can anyone tell me about query cache using mysql and php. If i using query cache it will speed up the database.

Thanks in advance

MySQL caches queries by default depending upon size (see my.cnf). Does this answer your question. Or are you talking about caching in a different sense? PHP shouldn't come into it really, unless you're talking about html page caching (after PHP processing), in which case you should really be talking about apache and not PHP/MySQL.