I can find the php5 mod in the mods-available directory, but I'm not sure how to get it into the mods-enabled directory.
Also, I just wanted to check that this is the way to enable php on my device...I know that PHP is installed, but another dev has disabled it (and is uncontactable)!
You can use a2enmod or a2dismod to enable/disable modules by name.
From terminal, run: sudo a2enmod php5 to enable PHP5 (or some other module), then sudo service apache2 reload to reload the Apache2 configuration.
If anyone gets
ERROR: Module phpX.X does not exist!
just install the module for your current php version:
apt-get install libapache2-mod-phpX.X
You have two ways to enable it.
First, you can set the absolute path of the php module file in your httpd.conf file like this:
LoadModule php5_module /path/to/mods-available/libphp5.so
Second, you can link the module file to the mods-enabled directory:
ln -s /path/to/mods-available/libphp5.so /path/to/mods-enabled/libphp5.so
Source: Stackoverflow.com