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Re:PHP has been removed in macOS Monterey by mst on Thursday June 17, 2021 @08:34AM (#27538894)
That's a link to complete changelogs.

Those aren't an "incompatible changes seection".

perldelta covers bugfixes, feature additions etc.

Re:PHP has been removed in macOS Monterey by pjmlp on Thursday June 17, 2021 @10:15AM (#27539798)

   foreach entry in "https://perldoc.perl.org/perl#History" do
      open entry on browser
      search for "Incompatible Changes" section
      read section contents
Writing a script in Perl to do the above is left as exercise to the reader.

Hint, use LWP.