session_cache_limiter() returns the name of the current cache limiter.
The cache limiter defines which cache control HTTP headers are sent to
the client. These headers determine the rules by which the page content
may be cached by the client and intermediate proxies. Setting the cache
nocache disallows any client/proxy caching.
A value of
public permits caching by proxies and the
private disallows caching by proxies
and permits the client to cache the contents.
private mode, the Expire header sent to the client
may cause confusion for some browsers, including Mozilla. You can avoid
this problem by using
private_no_expire mode. The
expire header is never sent to the client in this mode.
The cache limiter is reset to the default value stored in session.cache_limiter at request startup time. Thus, you need to call session_cache_limiter() for every request (and before session_start() is called).
If cache_limiter is specified, the name of the current cache limiter is changed to the new value.
/* set the cache limiter to 'private' */
$cache_limiter = session_cache_limiter();
echo "The cache limiter is now set to $cache_limiter<br />";