Ondrej's PPA is not meant to be run on non-LTS versions of Ubuntu. Despite what the docs state (they are unfortunately not up-to-date), he decided to target LTS versions only.
This said, you may still need to make it work, maybe temporarily. Here is how.
1: Add the PPA
sudo add-apt-repository ppa:ondrej/php
2: Edit /etc/apt/sources.list.d/ondrej-ubuntu-php-lunar.list and change lunar to jammy:
deb https://ppa.launchpadcontent.net/ondrej/php/ubuntu/ jammy main
3: If you need the intl extension, download and manually install libicu70_70.1-2_amd64.deb from the jammy repository. It has no dependencies.
4: Pin libgd3 to the official Ubuntu version. Otherwise it will make a mess of your system (Ondrej's versio is newer, at the moment, but it has different and unsatisfiable dependencies, resulting in a "broken" package).
Create a file like this: /etc/apt/preferences.d/ondrejphp and paste this:
Package: libgd3
Pin: release n=lunar
Pin-Priority: 900
5: install your PHP packages
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