PHP files are downloaded instead of getting interpreted

I'm encountring some difficulties with my Apache2/PHP5. All was well-configured and working, but after reinstalling apache2, the PHP files are displayed without being interpreted.

I tried many workarounds like:

AddType application/x-httpd-php .php

in the httpd.conf file, but still get the same issue. Please note that httpd.conf was not changed.

Are you loading PHP Module ? In your httpd.conf, check :

LoadModule php5_module        libexec/apache2/libphp5.so

Of course, you must change module path, to where your libphp5.so is.

Furthermore, you also need your entry

AddType application/x-httpd-php .php

If you want to use indexes with .php, modify the dir_module condition :

<IfModule dir_module>
    DirectoryIndex index.html index.php
</IfModule>

But before running all of that, you could run an apt-get :

 apt-get install libapache2-mod-php5