Re-Installing PHP 5

[ryezak]

I am a complete Nubie with Linux.
I am attempting at installing a LAMP server.
I had issues with the mysql at first. So I removed it complete then re-installed and it worked.
Now the PHP5 will not work. When I put the localhost address of my webserver in my browser with the testphp.php. It just wants to open the .php as a text file.
How do completely purge and re-install the PHP5 and get it to work with Apache2?
tks

[mregister]

I would first try to re-install PHP5 with

sudo apt-get -f install php5

[mregister]

also, I should have asked, will apache serve up any files correctly? Like can you pull up a test.html? If so then I would try the re-install of php above. If not then I would focus my attention on apache2.

[mr.generic.user]

maybe also reinstall libapache2-mod-php5 and php5-mysql packages....