How do I install PHP together with Trac?

[Daniel Andersson <list@daniel-gr-andersson.com>]

Hi all

What is the best way to install PHP5 on my Debian 6 Squeeze system that 
I use for Trac?

When trying to do a simple installation I get:

# aptitude install php5
The following NEW packages will be installed:
  apache2-mpm-prefork{ab} libapache2-mod-php5{a} libonig2{a} 
libqdbm14{a} php5 php5-cli{a} php5-common{a} php5-suhosin{a}
0 packages upgraded, 8 newly installed, 0 to remove and 0 not upgraded.
Need to get 6,654 kB of archives. After unpacking 17.3 MB will be used.
The following packages have unmet dependencies:
  apache2-mpm-prefork: Conflicts: apache2-mpm which is a virtual package.
  apache2-mpm-worker: Conflicts: apache2-mpm which is a virtual package.
The following actions will resolve these dependencies:

     Remove the following packages:
1)     apache2-mpm-worker



Accept this solution? [Y/n/q/?]



I did not chose "Web server" in tasksel when installing Debian, can't 
remember why though. But I do not want to mess anything up, so how do I 
install PHP support?

The http://wiki.debian.org/PHP page doesn't help me much.


Thanks!

Daniel Andersson