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Install PHP 5.4

Use the following set of command to add PPA for PHP 5.4 in your Ubuntu system and install PHP 5.4.

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

Check Installed PHP Version:

# php -v

PHP 5.4.35-1+deb.sury.org~precise+1 (cli) (built: Nov 19 2014 19:34:07)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies

Install PHP 5.5

Use the following set of command to add PPA for PHP 5.5 in your Ubuntu system and install PHP 5.5.

$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get install -y php5.5

Check Installed PHP Version:

# php -v

PHP 5.5.19-1+deb.sury.org~precise+1 (cli) (built: Nov 19 2014 19:32:57)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies

Install PHP 5.6

Use the following set of command to add PPA for PHP 5.6 in your Ubuntu system and install PHP 5.6.

$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get install -y php5.6

Check Installed PHP Version:

# php -v

PHP 5.6.3-1+deb.sury.org~precise+1 (cli) (built: Nov 19 2014 19:34:53)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies