session_cache_limiter() returns
the name of the current cache limiter. If cache_limiter is specified, the name
of the current cache limiter is changed to the new value.
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 limiter to nocache disallows any client/proxy
caching. A value of public permits
caching by proxies and the client, whereas private disallows caching by proxies and
permits the client to cache the contents.
In 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.
注: private_no_expire was added in PHP 4.2.0.
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).
Also see the
session.cache_limiter configuration directive.