Easiest Way to Upgrade PHP 5.3 to PHP 5.6 on CentOS 6.7

For upgrade to php7.3: https://blog.remirepo.net/post/2016/02/14/Install-PHP-7-on-C...,

Before do:

yum-config-manager --enable remi-php70

or

yum-config-manager --enable remi-php73

Naybe first install yum-config-manager:

yum install yum-utils