how can manage the contents in memcached server?

[jzz]

memcached,
		 hi,all fans!

	i'm in the interests of studying memcached.i'm use php language.

	i find there is a problem about manageing the real contents i store in memcached server:i need a list of the keys .the keys i used to map my contents in server.
	sadly.i find no existing api i can use.i want use the api to know all the keys i used.
	so,i have to use other array which is a list to record the  key i used.this array is like the function of index to Databace.

	anyone has the same problem as me??