How to upgrade PHP 5.2 to PHP 5.3 on Debian Lenny

Its very simple to upgrade PHP 5.2 to PHP 5.3 for Debian Lenny and it's easy to upgrade via a few commands with the apt-get

1. Add these lines to the apt sources at /etc/apt/sources.list

   deb http://php53.dotdeb.org stable all
   deb-src http://php53.dotdeb.org stable all

2. The dotdeb repositry will require you to download and import the key

   wget http://www.dotdeb.org/dotdeb.gpg
   cat dotdeb.gpg | sudo apt-key add -
   

3. Now all that is left is to upgrade:

   apt-get update
   apt-get dist-upgrade

4. I have to confirm a couple of files that have to be overwriten.