These are the steps to upgrade to PHP 5.6:

Add the PPA containing version 5.6 of php for Ubuntu 12.04:

sudo apt-add-repository ppa:ondrej/php5-5.6
sudo apt-add-repository ppa:ondrej/php5

Run these command in terminal to upgrade php :

sudo apt-get update

If everything works great, you have successfully upgraded to php5.5.

If an error occurs like file already exists in your apt cache, in this case run these command to overwrite cache files:

sudo apt-get clean all
sudo apt-get -o Dpkg::Options::="--force-overwrite" -f install
sudo apt-get clean all

Upgrade and delete old version of apache:

Delete old apache2 version:

Make note of the enabled modules in the current version of your Apache HTTP Server instance (copy file names to any text file):

cd /etc/apache2/mods-enabled/
ls -al > ~/enabled-mods.txt

Stop any existing instance of the Apache HTTP Server:

service apache2 stop

Delete the directory containing the Apache HTTP Server configuration (make a backup before deleting files):

rm -r /etc/apache2/

Remove the existing installation of the Apache HTTP Server:

apt-get remove apache2
apt-get purge apache2 apache2-utils apache2.2-bin apache2-common
apt-get autoremove

If you are sure about what you are trying to remove, you can run this command (at your own risk to remove everything having apache2 as prefix):

apt-get remove apache2*

Upgrade apache :

Add the PPA containing version 2.4 of Apache HTTP Server for Ubuntu 12.04:

sudo add-apt-repository ppa:ondrej/apache2

Run this command to install apache2:

sudo apt-get install apache2 apache2-doc apache2-utils

Install apache php module:

sudo apt-get install libapache2-mod-php5

Run following command to check updated version:

php -v
apache2 -v

Start apache:

service apache2 start

Check http://localhost in browser to see apache configuration

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