Laravel 5 - env() 总是返回 null

2022-01-15 00:00:00 environment-variables php laravel phpdotenv

我试图找出为什么我的 env() 助手总是返回 null.这会导致麻烦，尤其是在 app.php 文件中，默认情况下广泛使用 env() 帮助程序.也许有什么神秘的服务器设置?

I try to find out why my env() helper always returns null. This causes trouble especially in app.php file, where are env() helpers widely used by default. Perhaps any mysterious server setting?

我的环境文件:

APP_ENV=production APP_KEY=base64:mymagickey= APP_DEBUG=false APP_LOG_LEVEL=info APP_URL=http://www.example.com etc...

编辑 - 我尝试了以下:

php artisan cache:clear php artisan view:clear php artisan config:cache

当然，我正在使用这样的 env 助手:env('APP_ENV')

and ofcourse, i am using env helper like this: env('APP_ENV')

但仍然没有成功.奇怪的是，$_ENV php 变量包含 .env 文件中的每个变量.

But still no success. The wierd part is, that $_ENV php variable contains every single variable from .env file.

推荐答案

env(...) 缓存配置后函数将无法工作.(从 laravel 5.2 到当前 5.7)

env(...) function will not work after you cached the config. (starting from laravel 5.2 till current 5.7)

Laravel 文档说

如果您在部署期间使用 config:cache 命令，则必须确保仅从配置文件中调用 env 函数，而不是从应用程序中的任何其他位置.

If you are using the config:cache command during deployment, you must make sure that you are only calling the env function from within your configuration files, and not from anywhere else in your application.

所以正确的答案是

如果您从应用程序中调用 env，强烈建议您将正确的配置值添加到配置文件中，然后从该位置调用 env，从而允许您将 env 调用转换为配置调用.

If you are calling env from within your application, it is strongly recommended you add proper configuration values to your configuration files and call env from that location instead, allowing you to convert your env calls to config calls.

我从同一个文档

但为了快速修复，这样做可以:

But for a quick fix this will do:

php artisan config:clear

现在应该清楚为什么，当您尝试 config:cache 时，它没有帮助，即使它在缓存之前清除了配置.

And now it should be clear why, when you tried config:cache, it did not help, even though it clears the config prior to caching.

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