Enter the following commands on the terminal to upgrade PHP:
1 . To install the latest PHP 7, you need to turn on EPEL and Remi repository.
2. Next, you need to install yum-util packages
# yum install yum-utils -y
3. Enable remi repo as per the desired PHP version, for PHP 7.4,
If you want to install PHP 7.3, you can use the following command, # yum-config-manager --enable remi-php73
If you want to install PHP 7.4, use below command.
# yum-config-manager --enable remi-php74
# yum update
4. Now install PHP 7.4 with all necessary modules with the command below.
# yum install php php-mcrypt php-cli php-gd php-curl php-mysql php-ldap php-zip php-process php-ldap
That's all.