My server index.php is showing a blank page

Question

I have managed to set up my server and upload my first php code to see if the server is working, and it is.

• PHP 7.0.30-0ubuntu0.16.04.1 (cli) (NTS)
• mysql Ver 14.14 Distrib5.7.23, for Linux (x86_64)
• phpmyadmin 4.5.4.1deb2ubuntu2.1

I put a folder in /var/www/html/booking

But when I access the folder: localhost/booking/index.php, I only see a white page.

I have set the error from Off to On in php.ini

Still I can't see any errors.

So now I hope someone can help me.