[eluser]Patrick Savalle[/eluser]
Copy
/system/libraries/Cache/Cache.php to
/application/libraries/Cache and add the method below to the class.
You now have function that can cache every other function's result. Use it only for TRUE / context-free functions, i.e. functions whose result only depend on their arguments.
It uses the standard codeigniter caching mechanism:
http://ellislab.com/codeigniter/user-gui...ching.html
It is equivalent to the standard PHP function call_user_func_array:
http://php.net/manual/en/function.call-u...-array.php
--> To the codeigniter team, please add this to the new release. 
Code:
/**
* call_user_func_array_cached
*
* @param function, variable args
* @return object
*/
function call_user_func_array_cached( $function, $param_arr )
{
// ----------------------------------------------------------
// Cached version of call_user_func_array, use only for TRUE
// function, i.e. function whose result only depend on args
// ----------------------------------------------------------
if ( is_array( $function ) )
{
if ( is_object( $function[0] ) )
{
$mangled_name = 'obj'. get_class( $function[0] ) .
$function[1] . serialize( $param_arr );
}
else
{
$mangled_name = $function[0] . $function[1] .
serialize( $param_arr );
}
}
else
{
$mangled_name = $function . serialize( $param_arr );
}
$cache_key = md5( __CLASS__ . $mangled_name );
// ------------------------------------------------------------------
// Mangle function signature and try to get from cache
// ------------------------------------------------------------------
$result = $this->get( $cache_key );
if ( empty( $result) )
{
// ------------------------------------------------------------------
// If not, call the function and get the result, we can only
// cachify methods of subclasses of this class
// ------------------------------------------------------------------
$result = call_user_func_array( $function, $param_arr );
// ------------------------------------------------------------------
// Store the result in the cache for next time
// ------------------------------------------------------------------
$this->save( $cache_key, $result );
}
return $result;
}
Example of usage:
Code:
$cache_adapter = 'apc';
$this->load->driver( 'cache', array( 'adapter' => $cache_adapter, 'backup' => 'dummy' ) );
$this->cache->{$cache_adapter}->is_supported( );
...
$result = $this->cache->call_user_func_array_cached( 'your_function', array( $arg1, $arg2, ... ) );
Don't overuse this function. Only cache costly operations that form a performance bottleneck and never rely on the cache to actually store anything.
