Help installing PHP on Ubuntu (Solved. Thank you!)

(I'm currently using Firefox 124.01 on Ubuntu 22.04.03 LTS) (My formatting is also givinge problems... I want to eat my own eyeballs out right now...)

I'm very new to Linux, and trying to get PHP installed, but it won't render anything...

Following this guide (https://ubuntu.com/server/docs/programming-php), I started with:

sudo apt update
sudo apt install apache2

Test Page Success!

So I continue with:

sudo apt install php libapache2-mod-php
sudo apt install php-mysql
sudo apt install php-cgi

Then:

sudo systemctl restart apache2.service

I write the following in /var/www/html/index.php:

<?php

phpinfo();

Test Text1

?>

Test Text2

I see "Test Text2" and nothing else. I see my PHP tags and their contents upon source inspection.

Then I perform the following:

apt list --installed | grep php
sudo apt purge php
apt list --installed | grep php (0 Results)

And try again:

sudo apt install php libapache2-mod-php
sudo apt install php-mysql
sudo apt install php-cgi

sudo systemctl restart apache2.service

No luck... Any ideas what's going on?

A little additional info:

~$ which php
/usr/bin/php

~$ php -v
PHP 8.1.2-1ubuntu2.14 (cli) (built: Aug 18 2023 11:41:11) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.1.2, Copyright (c) Zend Technologies
    with Zend OPcache v8.1.2-1ubuntu2.14, Copyright (c), by Zend Technologies

~$ apt list --installed | grep php

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libapache2-mod-php8.1/jammy-updates,jammy-security,now 8.1.2-1ubuntu2.14 amd64 [installed,automatic]
libapache2-mod-php/jammy,jammy,now 2:8.1+92ubuntu1 all [installed]
php-common/jammy,jammy,now 2:92ubuntu1 all [installed,automatic]
php-mysql/jammy,jammy,now 2:8.1+92ubuntu1 all [installed]
php8.1-cli/jammy-updates,jammy-security,now 8.1.2-1ubuntu2.14 amd64 [installed,automatic]
php8.1-common/jammy-updates,jammy-security,now 8.1.2-1ubuntu2.14 amd64 [installed,automatic]
php8.1-mysql/jammy-updates,jammy-security,now 8.1.2-1ubuntu2.14 amd64 [installed,automatic]
php8.1-opcache/jammy-updates,jammy-security,now 8.1.2-1ubuntu2.14 amd64 [installed,automatic]
php8.1-readline/jammy-updates,jammy-security,now 8.1.2-1ubuntu2.14 amd64 [installed,automatic]
php8.1/jammy-updates,jammy-updates,jammy-security,jammy-security,now 8.1.2-1ubuntu2.14 all [installed,automatic]
php/jammy,jammy,now 2:8.1+92ubuntu1 all [installed]

/etc/apache2/mods-enabled$ ls
access_compat.load  authz_core.load  deflate.load  mime.load         php8.1.load      status.load
alias.conf          authz_host.load  dir.conf      mpm_prefork.conf  reqtimeout.conf
alias.load          authz_user.load  dir.load      mpm_prefork.load  reqtimeout.load
auth_basic.load     autoindex.conf   env.load      negotiation.conf  setenvif.conf
authn_core.load     autoindex.load   filter.load   negotiation.load  setenvif.load
authn_file.load     deflate.conf     mime.conf     php8.1.conf       status.conf