php version not found in monterey update

I’m not sure why you would think I would have any documentation much less full documentation. Search the Internet for how to install PHP. I

The simplest method would probably using a package manager like homebrew, fink, or Macports.

Then, you’ll need to figure out how to integrate it into your Web server because it won’t be installed in the same location it was previously.

Unlike Big Sur 11.6.1 which advised when running PHP7:

PHP is included in macOS for compatibility with legacy software.

Future versions of macOS will not include PHP

Monterey no longer provides PHP in Xcode 13.1, the command line tools for Xcode, or as part of the operating system at /usr/bin.

You will have to determine if a Monterey-compatible version of PHP exists and install it from the web.

You gave to install Brew package

then in terminal

brew install openssl

Then

cd /usr/local/lib

sudo ln -s /usr/local/opt/openssl/lib/libssl.dylib libssl.dylib

sudo ln -s /usr/local/opt/openssl/lib/libcrypto.dylib libcrypto.dylib

Consider the following command invocation with homebrew (once installed) to determine the visual dependencies on PHP8 before it is installed:

brew deps --tree --installed php

OpenSSL is just one of many dependencies required for the PHP8 installation.

It doesn’t appear to be part of Monterey. It certainly isn’t in the same location it was in previous OS version.