Why is php not working on web server in Ubuntu?

Question

linux

Today I set up a web-server and cloned the repository. All code is in place. But it doesn't show up, here is my site config:
ServerName play.leo.com
AddType application/x-httpd-php .php .phtml
AddDefaultCharset UTF-8
ServerAlias ​​www.play.leo.com
DocumentRoot /var/www/play
Options FollowSymLinks
AllowOverride All
Order allow,deny Allow
from all

Answer 1

Take a look in /var/log/apache2

Answer 2

I suspect that the problem is moving from Apache 2.2- to 2.4 +
httpd.apache.org/docs/2.4/upgrading.html
If everything is set up correctly, it should be enough to replace:

Order allow,deny
Allow from all

on the:
Require all denied

Answer 3

1. Is the host listed in /etc/hosts?
2. Is the web server enabled?
3. If scripts start with "<?" - is their support enabled in php.ini (short_open_tag) ?
4. What does the web server write in the logs?
5. If the web server is apache2.4 - see Andrey Bezpalov
's answer 6. "Doesn't work" - a bad definition, use a more accurate one, maybe there is no access to the database / cache server, there are also some nuances here.
7. Perhaps the php version is too old, or the libraries / pecl extensions / pear extensions are not installed.
8. If composer is used, check if dependencies are loaded.
This is the most basic stack of directions as to why it might not work, for more precise answers - be specific with the question.