What should I do if env cannot obtain data in laravel?

In laravel, you can use the "php artisan config:clear" statement to clear the config cache to solve the problem that env cannot obtain data; the reason for this problem is that the cache configuration file reads the environment variables through the env function, which may This will result in the environment variable not being read, so null is returned.

The operating environment of this article: Windows 10 system, Laravel version 5.4, Dell G3 computer.

What to do if the env in laravel cannot obtain data

Solution:

Clear config cache command

php artisan config:clear

Reason

In Laravel, if you execute the php aritisan config:cache command, Laravel will "compile" and integrate all the configuration files in the app/config directory into a cache configuration file into bootstrap/cache/ config.php, each configuration file can read environment variables through the env function, which can be read here. But once you have this cache configuration file, you cannot read the environment variables using the env function elsewhere, so null is returned.

Let's take a look at this code, Illuminate/Foundation/Bootstrap/DetectEnvironment. php line 18:

public function bootstrap(Application $app){
        if(!$app->configurationIsCached()){
            $this->checkForSpecificEnvironmentFile($app);
            try{
                (newDotenv($app->environmentPath(),$app->environmentFile()))->load();
            }catch(InvalidPathException$e){
            }
        }
    }

This method will run after the framework is started. This code shows that if a cache configuration file exists, environment variables will not be set. The configuration will read the cache configuration file instead of Will read environment variables again.

Therefore, when reading configuration files elsewhere in the app/config directory, do not use the env function to read environment variables. In this way, once you execute php artisan config:cache, the env function will not work. . All environment variables to be used are read through env in the configuration file in the app/config directory. If environment variables are used elsewhere, the configuration file is read uniformly instead of using the env function.

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