LAMP: Updating PHP from 5.3.x-ubuntu to 5.4.x (custom rep.)

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ondrej/php5-oldstable
sudo apt-get update; sudo apt-get install php5

Thanks to: http://askubuntu.com/questions/343560/update-server-php-version-to-5-4-10-via-the-command-line