PHP Object Caching system with a SQLite backend store and automatic content expiration.
Cach is stored using a SQLite database in a RAM disk in /dev/shm
.
- PHP 8.0+
- PDO functions in PHP
- SQLite functions in PHP
- JSON functions in PHP
- Ability to write to
/dev/shm
- igbinary
- msgpack
If either igbinary or msgpack modules are available we will automatically use them as the serialization storage method in the database. If neither are available we fall back to JSON.
require("/path/to/dir/cache.class.php");
$cache = new \Scottchiefbaker\Cache\Sqlite();
// Store an item
$key = "cust:123";
$data = ['name' => 'Jason Doolis', 'age' => 13, 'animal' => 'kitten'];
$expires = time() + 3600;
$ok = $cache->set($key, $data, $expires);
// Fetch an item
$data = $cache->get($key);
Over time objects will be added and deleted to the cache. This may create
fragmentation in the database so it might be a good idea to VACUUM
it every
so often. We have provided a method to do this:
// Remove all expired entries and defragment the database
$vacuum = true;
$ok = $cache->remove_expired_entries($vacuum);
function get_slow_data($id) {
global $cache;
$ckey = "item:$id";
$data = $cache->get($ckey);
if ($data) { return $data; }
// Not found in cache go get the data the slow way
$data = my_slow_data_function($id);
// Store the data in the cache for two hours
$ok = $cache->set($ckey, $data, time() + 7200);
return $ret;
}