public function rpop($key)
    {
        $this->init();
        $result = $this->driver->rpop($key);
        return $this->convertFalseToNull($result);
    }
public function rpop($key)
    {
        $this->init();
        $result = $this->driver->rpop($key);
        return $this->convertFalseToNull($result);
    }
public function rpop ( $ key ) { $ this -> init ( ) ; $ result = $ this -> driver -> rpop ( $ key ) ; return $ this -> convertFalseToNull ( $ result ) ; }
Remove and get the last element in a list
@param string $key
@return string|null
Remove and get the last element in a list