How to pin specific version of PHP?

[ElijahLynn]

We are experiencing segfaults and suspect it may be PHP 8.1.17 and want to roll back to 8.1.16 or earlier. This issue/thread is to document how to do that, which I am going to figure out and post here. Any suggestions are useful too.

[neidiom]

php_packages:
  - php8.1-fpm=8.1.17-1+0~20230316.37+debian11~1.gbp0c3ecb

make sure the package exists on the server

apt-cache showpkg php8.1-fpm

[ElijahLynn]

Thank you!