php env 没有值怎么办

；variables_order
；Default Value: “EGPCS”
；Development Value: “GPCS”
；Production Value: “GPCS”

；variables_order
Default Value: “EGPCS”
；Development Value: “GPCS”
；Production Value: “GPCS”

if (is_file(ROOT_PATH . '.env')) {
    $env = parse_ini_file(ROOT_PATH . '.env', true);
    foreach ($env as $key => $val) {
        $name = ENV_PREFIX . strtoupper($key);
        if (is_array($val)) {
            foreach ($val as $k => $v) {
                $item = $name . '_' . strtoupper($k);
                putenv("$item=$v");
            }
        } else {
            putenv("$name=$val");
            //加入这一句
            $_ENV[$name]=$val;
        }
    }
}