CODEWITHSUNDEEP
phpfilecachingcache-control
user4271704
user4271704

Reputation: 763

How to set an expiry for a cache file?

I am wondering how cache systems like doctrine-cache or zend-cache, set an expiry for cache files if those files are not in /tmp folder. How is possible to set an expiry for cache files? If I want to use my own cache file system with php rather than using doctrine or zend, how can I set an expiry for it if I don't want to place it in /tmp folder?

Upvotes: 1

Views: 3185

Answers (2)

Robert
Robert

Reputation: 20286

The cache is pretty simple. Let's say you have directory cache. You set expiration time for files which are there under variable $expire

So the algorithm is

$file = "cache/cached.jpg";
$expire = 60 * 3600;

if (filectime($file) > time() + $expire)
{
   // reload file and invalidate cache
} else if (file_exists($file){
   // get from cache
} else {
  // get file and save it to cache then return  
}

but it's better to use caches that are there like http cache etc with expire header, varnish etc.

Upvotes: 2

Wax Cage
Wax Cage

Reputation: 788

I would recommend using cache service as Memcached. There is a third parameter to a set function, which means number of seconds after which the value will expire.

Upvotes: 1

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