Gdn_Cache::increment PHP Method

This will fail if the key does not already exist. Cannot take the value of $Key below 0.

abstract public increment ( string $Key, integer $Amount = 1, $Options = [] ) : integer
$Key	string	Cache key used for storage.
$Amount	integer	Amount to shift value up.
return	integer	new value or false on failure.

    public abstract function increment($Key, $Amount = 1, $Options = array());

Gdn_Cache