PHP Fatal error: require(): Failed opening required

Sounds to me like you have a permission issue. Check who the owner is of the files and chownthem properly and also don't forget to chmodthe storage directory.

I thought so too, but it isn't. I also tried these steps: https://pear.php.net/manual/en/installation.checking.php

Here i get an 500 error.

have you been changing index.php to try and get it to work without correctly setting document root?

I don't understand why it is looking in public for the bootstrap folder.

How are you installing? You are using Composer, yes?

Yes i am using composer. When i use phpinfo(), the index is working, but when i use require or require_once, i get an 500 error.

Could pear be the problem?

Ok, i think it was a pear problem, now the public/index.php is working! But i get a:

The requested URL /login was not found on this server.

pear? who uses that still?

I don really know, but i included the path and it is working now. I don't ask for that :-)

I included it in my php.ini, maybe it was just fortune, but it is working. Also, i removed the php.ini (only with an _php.ini) and re-include it, restart apache and now it is working.