Ajax caching problem Solving approach _php skills

I use PHP and Ajax combined to add data, refresh the foreground page, the data has not changed.
I changed php dynamic script, only to find the Internet Explorer and then enter the address to see the effect.
These are not the reasons for caching ah? How to solve?
Ajax caching Problem resolution approach:
is a problem with caching.
Add header ("Cache-control:no-cache, Must-revalidate") to the service end;
and add random or time strings to your JS submission parameters.
url+ "? timestamp=" +new Date (). GetTime ();