public function save(string $sessionIdentifier, string $sessionData): void
    {
        self::$files[$sessionIdentifier] = [
            'data' => $sessionData,
            'time' => microtime(true)
        ];
    }
public function save(string $sessionIdentifier, string $sessionData): void
    {
        self::$files[$sessionIdentifier] = [
            'data' => $sessionData,
            'time' => microtime(true)
        ];
    }
public function save ( string $ sessionIdentifier , string $ sessionData ) : void { self :: $ files [ $ sessionIdentifier ] = [ 'data' => $ sessionData , 'time' => microtime ( true ) ] ; }
Saves the encrypted session data to the storage.

@param  string $sessionIdentifier The string used to identify the session data.
@param  string $sessionData       The encrypted session data.
@return void
Saves the encrypted session data to the storage .