Install extensions in php 7 cent os follow these steps
1. curl 'https://setup.ius.io/' -o setup-ius.sh
2. sudo bash setup-ius.sh
3. sudo yum install -y mod_php70w php70w-cli php70w-mysqlnd php70w-json php70w-gd php70w-dom php70w-simplexml php70w-mcrypt php70w-intl httpd mysql-server git
