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

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