An improved generic caching function
You may remember my generic caching function from a while back.
One of the things I struggled with a little bit was coming up with a key for anonymous functions. I ended up using the SPL ReflectionFunction class to come up with a unique hash for a function and argument list. I happened upon a better solution earlier today: spl_object_hash(). Because PHP's anonymous functions are actually an instance of the (internal) Closure class, they can be hashed no problem.
Here is the updated function:
<?php
function createCached($fn, $ttl = 100){
return function() use($fn, $ttl){
$args = func_get_args();
if (!is_string($fn)){
$key = md5(spl_object_hash($fn).serialize($args)); //This is the bit that's changed
} else {
$key = md5($fn.serialize($args));
}
$result = apc_fetch($key, $success);
if ($success) return $result;
$result = call_user_func_array($fn, $args);
apc_store($key, $result, $ttl);
return $result;
};
}
Usage remains exactly the same.
First posted: Thu, 29 Jul 2010 14:00:02 +0000