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Posted by Colin McKinnon on 02/19/07 20:43
lister wrote:
>
> I guess I could cache the username in the user's session data to save
> a DB lookup (or maybe even a cookie to save looking up any session
> data at all). However, I still cannot see how I can ever cache the
> resultant page since the header is user specific, even if everything
> else is static?
>
> How do other people handle this? Having the username at the top seems
> a pretty common design, so I guess the problem must have been tackled
> somehow?
HTTP specifically allows for this with the vary header (you'll need to send
an expires and/or a cache-control: max-age header too).
e.g.
header("Cache-control: max-age=86400; must-revalidate");
header("Vary: Cookie");
You can also cache parts of your code serverside (you should add code to
expire the cache):
$cache_key=$tmp_dir . md5($_SERVER['REQUEST_URI'] .
$_COOKIE[session_name()]);
if (file_exists($cache_key)) {
print file_get_contents($cache_key);
} else {
ob_start();
....
file_put_contents($cache_key, ob_get_contents());
ob_end_flush();
}
C.
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