Laravel frame step pit (I)

Official documents ：http://laravel.p2hp.com/cndocs/9.x/installation

1、 Environment configuration
Before loading the environment variables of the application ,Laravel Will determine whether it has been provided externally APP_ENV environment variable , Or whether it specifies --env CLI Parameters . If so ,Laravel Will try to load a .env.[APP_ENV] file （ If it exists ）. If it doesn't exist , The default will be loaded .env file .

.env Any variable in the file can be overwritten by external environment variables , For example, server level or system level environment variables .

2、 Be careful Laravel Clear cache php artisan cache:clear A pit of

Laravel The order of php artisan cache:clear Used to clear various caches , Pages such as ,Redis, Configuration file cache , It will empty Redis All data in the database , For example, the default Redis Of database yes db0, Then after executing this command , It will be emptied db0 All data in .

The cache file is located in /bootstrap/cache/cache.php in , It is cached, including .env And other environmental variable data ！！

php73 artisan optimize:clear

here , It is recommended to add single point test and log output , It is convenient to locate problems quickly and accurately , It's not a metaphysical monster environmental problem .