Memcache::pconnect() is similar to Memcache::connect() with the difference, that the connection it establishes is persistent. This connection is not closed after the end of script execution and by Memcache::close() function. Also you can use memcache_pconnect() function.
Point to the host where memcached is listening for connections.
Point to the port where memcached is listening for connections.
Value in seconds which will be used for connecting to the daemon. Think twice before changing the default value of 1 second - you can loose all the advantages of caching if your connection is too slow.