Step 1: Add EPEL and REMI Repository
sudo yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
sudo yum -y install https://rpms.remirepo.net/enterprise/remi-release-8.rpmStep 2: Install PHP 7.4 on CentOS 8 / RHEL 8
sudo dnf -y install dnf-utilsStep 3: Enable the module stream for PHP 7.4 on CentOS 8 / RHEL 8
sudo dnf module reset php -y
sudo dnf module install php:remi-7.4Step 4: Install additional packages
sudo dnf update
sudo yum install php php-curl php-cli php-mysql php-gd php-common -yphp --modules
