php 5.3, 5.4, 5.5 upgrade/downgrade in ubuntu 12.04


The start is from php 5.3.10, a ubuntu 12.04 default version.
 
Upgrade to 5.4.x 
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ondrej/php5-oldstable
sudo apt-get update
sudo apt-get install php5


Upgrade to 5.5.x 
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ondrej/php5
sudo apt-get update
sudo apt-get install php5

Downgrade to 5.4.x from 5.5.x
sudo apt-get install -y ppa-purge
sudo add-apt-repository -y ppa:ondrej/php5-oldstable
sudo apt-get update
sudo ppa-purge ppa:ondrej/php5
sudo apt-get update
sudo apt-get upgrade -y 
sudo apt-get autoremove -y 
sudo apt-get autoclean

Downgrade to 5.3.x from 5.5.x
sudo apt-get install -y ppa-purge
sudo ppa-purge ppa:ondrej/php5
sudo apt-get update
sudo apt-get upgrade -y 
sudo apt-get autoremove -y 
sudo apt-get autoclean


Downgrade to 5.3.x from 5.4.x
sudo apt-get install -y ppa-purge
sudo ppa-purge ppa:ondrej/php5-oldstable
sudo apt-get update
sudo apt-get upgrade -y 
sudo apt-get autoremove -y 
sudo apt-get autoclean


Uninstall an installation
Manually delete all the files/folders with php find by whereis


Install specific version using tar.gz
If you want to do a manually installation. You must uninstall the installation first as described in the  "Uninstall an installation". 
As the upgrade and downgrade will always update to a latest version of 5.4 and 5.5, when you want to update to a specific 5.4.x or 5.5.x version (or the latest version still not in the repository). Then you need to install it manually. And you can do it as below:
(The latest list of available version in the repository is here http://php.net/releases/, but maybe not the fresh latest version.)
So if you want to update to a designed version, you need to download the tar ball and compile it by yourself if you can not wait for the update of a ppa repository.
Download the latest tar.gz to update:
a) Download the latest tar ball here
b) Extract to a folder  php-5.4.x where you want to install the php 5.4.x.
c)  cd to the folder php-5.4.x.
d)  Check the INSTALL file in the downloaded folder to see the installation construction.
e) Normally, it is as following:
./configure --with-mysql (this is with mysql extensions enabled, if you want also with apache, you can  use others, you can use ./configure --help to check how to use others )
f)  sudo make
g) sudo make install
h) php -v, you can use this to  check whether you update to the version that you want.


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