First get your system updated
yum update -y; yum upgrade -yInstall LAMP package as below
yum install httpd mariadb-server mariadb php php-mysql -y
systemctl enable httpd
systemctl enable mariadb
systemctl start httpd
systemctl start mariadbConfigure MySQL/MariaDB initial setup.
mysql_secure_installationTo install additional PHP package/extension simply search as below
yum search php-Add http service to firewalld
firewall-cmd --permanent --zone=public --add-service=http
firewall-cmd --permanent --zone=public --add-service=https
firewall-cmd --reload