I have 4 projects in laravel 4 and 1 in laravel 5.4 so I uploaded all of them in Host server the 4 (laravel 4) are working but the (laravel 5.4)project dose not works an have error like this.Error Page
this is my config.php and .env enter image description here
You can try thi way
clean cache by run these command
php artisan cache:clear
php artisan config:clear.
And then restart your server
your DB_PORT is wrong (as localhost) it should be
DB_PORT=3306
another tip
either create a mysql user reshad_rphs or change your .env file DB_USERNAME to existing user like root.
Its always recommended to use a separate user for apps other than root user.
to test whether everything else works just use root and see.
DB_USERNAME=root