PHP APC problems when storing objects -

i trying build configuration parser application installed apc today, everytime try put serialized object in store, not in there , not. (i checking apc.php version[3.1.8-dev] on php 5.3.16 [my dev environment], sure data not in cache). how pass data cacher:

// data before caching array ( 'key' => md5($this->filename), 'value' => serialize($this->cfg) );  // caching interface function($argc){ $key = $argc['key']; cache\apc::getinstance()->set($key,$argc['value']); }  // caching method described above public function set($key, $val) {     if (apc_exists($key)) {         apc_delete ($key);         return apc_store($key, $val);     }     else          return false; }   // constructor of configuration class.  // 1st looks configuration in // cache if not present performs reading file. public function __construct($filename = '/application/config/application.ini',                                $type = self::config_ini) {     if (defined('system_cache') && system_cache === 'apc'){         $key = md5($filename);         $cfg = apc::getinstance()->get($key);          if (!empty($cfg)) {              print "from cache";              $this->cfg = unserialize($cfg);             return;         } else {             print "from file";         }      }  } 

i did few tests , there not problem md5() key (which thought while writing question) nor apc itself. stuck on one, nothing odd in logs, if can give me @ least directions appreciated.

thanks in advance!

the problem in code:\

public function set($key, $val) {     /*      *      * if key exists in cache delete , store again,      * how exist when else clause that...      */     if (apc_exists($key)) {         apc_delete ($key);         return apc_store($key, $val);     }     // wrong in current case     // cuz function never store , if     // never match..     else          return false; } 

note: think , keep eyes open, if still can't find off pc , give rest. after 10-15 minutes , pown code. helps! :d