How to install php 7.3 and use the ondrej/php PPA.
reference: https://php.watch/articles/Ubuntu-PHP-7.3
cPanel info:
reference: https://documentation.cpanel.net/display/76Docs/Installation+Guide
DigitalOcean LAMP install tutorial.
Article: Why you should be using supported PHP versions
reference: https://kinsta.com/blog/php-versions/
PHP version tar-ball downloads
reference: https://www.php.net/downloads
Article: Why you should upgrade to PHP version 7+
reference: https://wp-rocket.me/blog/why-you-need-to-upgrade-to-php-7-asap-and-how-to-do-it-right-now/
Guide to using APT command
reference: https://itsfoss.com/apt-command-guide/
Using PPA in Ubuntu
reference: https://itsfoss.com/ppa-guide/
How to install PHP 7.3
reference: https://www.rosehosting.com/blog/how-to-install-php-7-3-on-ubuntu-16-04/
Debian package management
reference: https://wiki.debian.org/DebianPackageManagement
wordpress.org article on why to update PHP
reference: https://wordpress.org/support/update-php/
F0rum post about what PHP extension are required for WordPress
How to install a LAMP stack
reference: https://www.linuxbabe.com/ubuntu/install-lamp-stack-ubuntu-18-04-server-desktop
Difference between a daemon and a service
reference: https://stackoverflow.com/questions/28139377/daemon-and-service-difference
How to install software on Linux (discussion of alternate package managers)
reference: https://lifehacker.com/how-to-install-software-on-linux-1822447190
Raspberry Pi LAMP installation
reference: https://projects.raspberrypi.org/en/projects/lamp-web-server-with-wordpress/3
How to get PHP extension version (via command and program)
reference: https://stackoverflow.com/questions/14626262/retrieve-extension-version-in-php
DigitalOcean forum – Why can’t I upgrade to PHP 7.3 (note about a PPA for apache2)
reference: https://www.digitalocean.com/community/questions/why-can-t-i-upgrade-to-php-7-3
How to install PHP 7.4, 7.3 etc on Ubuntu (comments about extensions)
reference: https://tecadmin.net/install-php-7-on-ubuntu/
DigitalOcean forum – how to set up a PTR record
reference: https://www.digitalocean.com/community/questions/how-do-i-setup-a-ptr-record
reference 2: https://www.digitalocean.com/community/questions/how-do-i-set-up-reverse-dns-for-my-ip
How to set up PTR and reverse DNS
reference: https://www.itworld.com/article/2833006/how-to-setup-reverse-dns-and-ptr-records.html
How to install PHP on Ubuntu 18.04 (also php 7.3 on Ubuntu 18.04)
reference: https://linuxize.com/post/how-to-install-php-on-ubuntu-18-04/
Managing Multiple PHP versions via the ondrej/php PPA
reference: https://mwop.net/blog/2019-04-30-ondrej-multiversion-php.html
GUI install of packages, notes on “PPA Purge”
reference: https://www.tecmint.com/add-remove-purge-ppa-in-ubuntu/
Main page for Ondrej
reference: https://launchpad.net/~ondrej/+archive/ubuntu/php
How to install and test a POSTFIX mail server
reference: https://www.linux.com/tutorials/how-install-and-test-postfix-mail-server/
Dovecot
reference: https://www.dovecot.org/
Troubleshooting problems with Postfix, Dovecot and MySQL
reference: https://www.linode.com/docs/email/postfix/troubleshooting-problems-with-postfix-dovecot-and-mysql/
How to use RKHUNTER (notes on excluding Postfix in install)
reference: https://hostpresto.com/community/tutorials/how-to-install-and-use-rkhunter-on-ubuntu-14-04/
How to configure WordPress to use SMTP
reference: https://www.siteground.com/tutorials/wordpress/use-smtp/
Basic Postfix configuration:
reference: http://www.postfix.org/BASIC_CONFIGURATION_README.html
How to install and configure Postfix on Ubuntu
How to install WordPress LAMP on Ubuntu:
reference: https://www.digitalocean.com/community/tutorials/how-to-install-wordpress-with-lamp-on-ubuntu-18-04
Forum – how do I see extension loaded on PHP?
reference: https://stackoverflow.com/questions/478844/how-do-i-see-the-extensions-loaded-by-php
How to WordPress and LAMP