how grab all content of site in vb

[mosz]

Hello
I want to write cache plugin
smth like that:

if (user not login) {
  $cache_id = $_SERVER['REQUEST_URI'];
  if (cache_exist($cache_id) {
    echo get_cache($cache_id);
   die();
  }
  else {
   generate_cache($cache_id);
 }
}

my problem is how to ganerate cache for request_uri ?
i want to have all content in one varible
smth like:
$cache = file_get_contents ($domain.$_SERVER['REQUEST_URI']);
but upper example make double site load.. so its not good

edit:
i want to grab content of:
index.php
forumdisplay.php
showthread.php
showpost.php


any idea ?

--------------- Added [DATE]1238581933[/DATE] at [TIME]1238581933[/TIME] ---------------

refresh

anybody know the answer ?
its very important for me

or maybe it can to show all varibles and arrays defined in php ?

[mosz]

thx for help :P
if anybody want to know answer:

all site content can be grab in global_complate hook in $output varible

all varible in php we can show by:

$vars = get_defined_vars();
print_r($vars);