How can I upgrade my PHP version?

I installed PHP 5.6 and when I run php -v it shows

PHP 5.6.30-7+deb.sury.org~precise+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

but when I get phpinfo(); in index file show in header:

PHP Version 5.3.10-1ubuntu3.26

How can upgrade my php version?

1 Answer

1. Open apache config:sudo gedit /etc/apache2/apache2.conf

2. At the end of the file add the following:
   <IfModule php5_module> PHPIniDir "/etc/php/5.6/apache2/php.ini" </IfModule>

3. Restart apache: sudo service apache2 restart

UPDATE: if that didn't work, try the following in a terminal:

1. Make sure php 5.3 module is installed:
sudo apt-get install libapache2-mod-php5.6

2. Disable 5.3 and enable 5.6:
sudo a2dismod php5.3 && sudo a2enmod php5.6 && sudo service apache2 restart

With attribution to Grayson Kent, this and this post