public function decrement($key, $offset = 1) {
		if (!array_key_exists($key, $this->_cache)) {
			return false;
		}
		return $this->_cache[$key] -= $offset;
	}
public function decrement($key, $offset = 1) {
		if (!array_key_exists($key, $this->_cache)) {
			return false;
		}
		return $this->_cache[$key] -= $offset;
	}
public function decrement ( $ key , $ offset = 1 ) { if ( ! array_key_exists ( $ key , $ this -> _cache ) ) { return false ; } return $ this -> _cache [ $ key ] -= $ offset ; }
Performs a decrement operation on specified numeric cache item.

@param string $key Key of numeric cache item to decrement.
@param integer $offset Offset to decrement - defaults to `1`.
@return integer|boolean The item's new value on successful decrement, else `false`.
Performs a decrement operation on specified numeric cache item .