1. http://www.thegeekstuff.com/2013/10/enable-gd-php/
2. https://www.tecmint.com/install-php-7-in-centos-7/

yum-config-manager --enable remi-php72   [Install PHP 7.2]
yum install php php-mcrypt php-cli php-gd php-curl php-mysql php-ldap php-zip php-fileinfo php-mbstring php-xml