Hi @AaronEsteban1,

You don’t actually upgrade or downgrade PHP versions, you can just install a second one, in your case 7.2.

Anyway, let’s see how to install PHP 7.2

*Centos 8 *

To get started, you need to add EPEL & Remi repository from where you will be able to install PHP 7.2 on CentOS 8 Linux.

dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

Next once you have the EPEL repository, run:

dnf install https://rpms.remirepo.net/enterprise/remi-release-8.rpm

Upon successful addition of EPEL and Remi repositories, execute the command below to get a list of available PHP module streams.

 dnf module list php

You should see an output of PHP version. The one we care about is remi-7.2, the latest PHP stream, To enable the module stream run the following :

dnf module enable php:remi-7.2

Once the PHP remi-7.2 module has been enabled, you can then proceed and install PHP

dnf install php php-cli php-common

Ubuntu

sudo apt-add-repository ppa:ondrej/php

Update the repository index.

sudo apt update

Install PHP 7.2 with the below command.

sudo apt install -y php7.2 php7.2-cli php7.2-common php7.2-fpm

To install extensions run

sudo apt install -y php7.4-mysql php7.4-dom php7.4-simplexml php7.4-ssh2 php7.4-xml php7.4-xmlreader php7.4-curl  php7.4-exif  php7.4-ftp php7.4-gd  php7.4-iconv php7.4-imagick php7.4-json  php7.4-mbstring php7.4-posix php7.4-sockets php7.4-tokenizer

The above are the standard required extensions. Having said that it’s good to have these extensions as well.

sudo apt install -y php7.2-mysqli php7.2-pdo  php7.2-sqlite3 php7.2-ctype php7.2-fileinfo php7.2-zip php7.2-exif

Regards,
KFSys