code/class/registry/cache.php
public function offsetUnset($offset)
    {
        apc_delete($this->getNamespace().'-class_'.$offset);

        if(parent::offsetExists($offset)){
            parent::offsetUnset($offset);
        }
    }
public function offsetUnset($offset)
    {
        apc_delete($this->getNamespace().'-class_'.$offset);

        if(parent::offsetExists($offset)){
            parent::offsetUnset($offset);
        }
    }
public function offsetUnset ( $ offset ) { apc_delete ( $ this -> getNamespace ( ) . '-class_' . $ offset ) ; if ( parent :: offsetExists ( $ offset ) ) { parent :: offsetUnset ( $ offset ) ; } }
Unset an item from the array

@param   int     $offset
@return  void
Unset an item from the array