public static function setEnv(string $env = null): void
    {
        // Set the env class to use
        self::$env = $env ?? self::$env ?? Env::class;
    }
public static function setEnv(string $env = null): void
    {
        // Set the env class to use
        self::$env = $env ?? self::$env ?? Env::class;
    }
public static function setEnv ( string $ env = null ) : void { // Set the env class to use self :: $ env = $ env ?? self :: $ env ?? Env :: class ; }
Set the environment variables class.

@param string $env [optional] The env file to use

@return void
Set the environment variables class .