javad71
It would appear that your issue is this. When you run your server for you laravel installation, your system is looking at the /path/to/code/public folder. This folder in the Laravel installation does have an .htaccess file that does some 'magic' for laravel translating the url you visit into the correct route.
Thus, the configuration inside of the phpmyadmin setup is not getting hit when you visit /phpmyadmin from the browser at the root of your laravel project.
A couple suggestions here for this.
1: Change Laravel to not use port 8000 if you can typically run phpmyadmin from that domain. If you started laravel server by running the artisan command, the port can be changed by running php artisan serve --port 8888
where 8888 is any other open port.
2: In the PHP My Admin configuration, change the port number it listens on to something else.
-Brian