:: How to upgrade php 5.3 on Debian
+ setup php5.3 repo

vi /etc/apt/source.list

add these line:

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

+ update repo and upgrade php 5.3

apt-get update
apt-get dist-upgrade

 
:: Links
+ Google
+ DebianTutorials