[PHP] caching question

[Jean-Christian IMbeault]

I am using Apache 1.3.27 and PHP 4.3.3.RC1 and someone has told me that 
my web page cannot be cached but I cannot figure out why. My friend 
tells me my pages all keep sending this in their headers:

Cache-Control: post-check=0, must-revalidate, no-store, no-cache, 
pre-check=0

But I can't figure out why the headers are set like this. I am not 
setting any headers so I am wondering if it is a setting in my web 
server, php.ini file or some other php scripts I have running in the 
background.

Also print_r($HTTP_SERVER_VARS) gives one server variable to be:

[HTTP_CACHE_CONTROL] = max-age=0

What does this variable mean and where was it set?

Any and all help appreciated!

Jean-Christian Imbeault

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Re: [PHP] caching question

[Curt Zirzow]

Jean-Christian IMbeault [EMAIL PROTECTED] wrote:
 I am using Apache 1.3.27 and PHP 4.3.3.RC1 and someone has told me that 
 my web page cannot be cached but I cannot figure out why. My friend 
 tells me my pages all keep sending this in their headers:
 
 Cache-Control: post-check=0, must-revalidate, no-store, no-cache, 
 pre-check=0
 
 But I can't figure out why the headers are set like this. I am not 
 setting any headers so I am wondering if it is a setting in my web 
 server, php.ini file or some other php scripts I have running in the 
 background.

In most cases you dont want your php output to get cached, and so php
will do this automaticly.  You can stop that from happening by sending
the same header with public as the paramater:

  Cache-Control: public

You also might want to set a few others:

/* if you are sending a file send the last modified time */
'Last-Modified: ' . gmdate(D, d M Y H:i:s, $unix_ts . ' GMT')

/* for old ie bug and older proxy caches */
'Pragma: no-cache'); 

/* if this applies */
'Expires: '. gmdate(D, d M Y H:i:s, time()-(1200). ' GMT')


Curt.
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