執行命令?php artisan cache:clear?并賦予?/storage?文件夾讀寫權限：?chmod -R 777 storage；

若在執行?php artisan cache:clear?時出現錯誤：Uncaught UnexpectedValueException: The stream or file "/storage/logs/laravel.log" could not be opened: failed to open stream: Permission denied in /vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php:87，需要賦予?/storage/log?讀寫權限：?chmod -R 777 storage/logs；

此時再執行?php artisan cache:clear，若繼續出錯：[ErrorException] file_put_contents(/bootstrap/cache/services.php): failed to open stream: Permission denied，需要賦予?bootstrap/cache?讀寫權限：chmod -R 777 bootstrap/cache；

再執行?php artisan cache:clear，若仍然出錯：[PDOException] SQLSTATE[HY000] [1045] Access denied for user 'xxx'@'127.0.0.1' (using password: YES)，則需要查看 laravel 的數據庫配置是否正確。