public function getset($key, $value)
    {
        $this->init();
        $result = $this->driver->getset($key, $value);
        return $this->convertFalseToNull($result);
    }
public function getset($key, $value)
    {
        $this->init();
        $result = $this->driver->getset($key, $value);
        return $this->convertFalseToNull($result);
    }
public function getset ( $ key , $ value ) { $ this -> init ( ) ; $ result = $ this -> driver -> getset ( $ key , $ value ) ; return $ this -> convertFalseToNull ( $ result ) ; }
Set the string value of a key and return its old value
@param string $key
@param string $value
@return string|null null if key was not set before
Set the string value of a key and return its old value