03:05:17 {master} ~/Projekty/cp/cp_www$ /usr/bin/env php -v
PHP 5.6.18-1+deb.sury.org~trusty+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
    with Xdebug v2.3.2, Copyright (c) 2002-2015, by Derick Rethans
03:05:19 {master} ~/Projekty/cp/cp_www$ php -v
PHP 5.6.18-1+deb.sury.org~trusty+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
    with Xdebug v2.3.2, Copyright (c) 2002-2015, by Derick Rethans
03:05:28 {master} ~/Projekty/cp/cp_www$ /usr/bin/php  -v
PHP 5.6.18-1+deb.sury.org~trusty+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
    with Xdebug v2.3.2, Copyright (c) 2002-2015, by Derick Rethans
03:05:35 {master} ~/Projekty/cp/cp_www$ /usr/bin/php5  -v
PHP 5.6.18-1+deb.sury.org~trusty+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
    with Xdebug v2.3.2, Copyright (c) 2002-2015, by Derick Rethans
03:05:37 {master} ~/Projekty/cp/cp_www$ php /usr/bin/composer.phar require doctrine/doctrine-fixtures-bundle
You are running composer with xdebug enabled. This has a major impact on runtime performance. See https://getcomposer.org/xdebug
Using version ^2.3 for doctrine/doctrine-fixtures-bundle
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - This package requires php >=5.5.0 but your PHP version (5.3.9) does not satisfy that requirement.


Installation failed, reverting ./composer.json to its original content.