How PHP is cached to memcache based on URL parameters

How does PHP cache to memcache based on URL parameters?

 
  $file =file (' link.txt ');
$max =count ($file)-1;
for ($i =0; $i <5; $i + +) {
$index =mt_rand (0, $max);
$temp = "". Trim ($file ["$index"]). "";

}
$link = Memcache_init ();
$minute _now = Date (' I ', Time ());//Take the current number of minutes
$key = ' rate '. $minute _now;
if (Memcache_get ($link, $key) = = null)
{
        Memcache_set ($link, $key, $temp, 0,//set);
        Note that 20 here is the cache expiration time, 60 seconds is 1 minutes
     
}
$re = Memcache_get ($link, $key, $temp);
Var_dump ($re);
if ($re >ratemax)
{

}else{
        Memcache_increment ($link, $key);
}


?>

Each refresh is changed without a cache
After caching
Demo Address http://niaochen006.sinaapp.com/zq.php
Cache time 20 seconds change once

What I want to achieve is
Http://niaochen006.sinaapp.com/zq.php?=AABB
Http://niaochen006.sinaapp.com/zq.php?=BBCC
http://niaochen006.sinaapp.com/zq.php?=*****

Cache different pages for each URL parameter
How to achieve it?

------Solution--------------------
Transform $key
You're now.
$key = ' rate '. $minute _now;
It's associated with time.

Change it to $url related.

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