https://www.vultr.com/docs/how-to-install-apache-mysql-and-php-on-centos-6
https://www.unzeen.com/article/1860/
https://support.rackspace.com/how-to/centos-6-apache-and-php-install/
https://www.centos.org/forums/viewtopic.php?t=56939
https://www.tecmint.com/install-php-5-4-php-5-5-or-php-5-6-on-centos-6/
https://www.zerostopbits.com/how-to-upgrade-php-5-3-to-php-5-6-on-centos-6-7/
https://spalinux.com/2015/01/install-php-5-5-on-centos-6
https://webtatic.com/packages/php56/
