public function increment($key, $step = 1)
    {
        $value = $this->get($key);
        $this->set($key, $value + $step);
    }
public function increment($key, $step = 1)
    {
        $value = $this->get($key);
        $this->set($key, $value + $step);
    }
public function increment ( $ key , $ step = 1 ) { $ value = $ this -> get ( $ key ) ; $ this -> set ( $ key , $ value + $ step ) ; }
Increments a numeric value

@param string $key
@param integer $step
@return void
Increments a numeric value