Are prepared statements cached server-side across multiple page loads with PHP?

Question

I learnt about prepared statements when making a JDBC-enabled Java application, and my app uses a connection pooling layer that assures me that prepared statements are cache

Answer 1

Prepared statements have nothing to do with result caching.

Result caching can be controlled via db server configuration or forced via memcached and the like.

I suggest you look into memcached, especially for PHP http://www.php.net/manual/en/book.memcached.php