PHP is needed to run various tools and is a useful thing to have installed in your host system.
We currently use PHP7.4 on our servers so it is useful to have a matching version locally.
You don't necessarily need PHP installed on your development machine as PHP is installed in the appserver Lando container.
If you do want to install it you can follow these instructions:
sudo apt-get install php7.4-cli php7.4-curl php7.4-gd php7.4-json php7.4-mbstring php7.4-mcrypt php7.4-mysql php7.4-opcache php7.4-readline php7.4-xml php7.4-zip
You will need homebrew installed first.
Use homebrew to install the version of PHP you want:
brew tap homebrew/versions brew tap homebrew/php brew install php74