public function increment($key,
                            $offset = 1,
                            $initial_value = 0,
                            $expiry = 0) {
      return $this->incrementInternal($key, $offset, $initial_value, $expiry,
                                      true);
  }
public function increment($key,
                            $offset = 1,
                            $initial_value = 0,
                            $expiry = 0) {
      return $this->incrementInternal($key, $offset, $initial_value, $expiry,
                                      true);
  }
public function increment ( $ key , $ offset = 1 , $ initial_value = 0 , $ expiry = 0 ) { return $ this -> incrementInternal ( $ key , $ offset , $ initial_value , $ expiry , true ) ; }
Increments a numeric item's value by the specified offset. If the item's
value is not numeric, and error will result.

@param string $key The key of the item to increment
@param int $offset The amount by which to increment the item's value
@param int $initial_value The value to set the item to if it doesn't exist.
@param int $expiry The expiry time to set on the item.

@return The new item's value on success or false on failure.
Increments a numeric item s value by the specified offset . If the item s value is not numeric and error will result .