note 125717 added to migration74.incompatible

Re: "The o serialization format has been removed. As it is never produced by PHP, this may only break unserialization of manually crafted strings." This little-o serialisation format was used by PHP3 but was never generated by PH PHP4 or above. The deserialization code still recognised it, though, for reasons of backwards-compatibility with PHP3. However, based on a bit of investigation, it looks like this code has been broken for about 15 years, so although this is listed as a deprecation, in practice it wasn't. See this Stack Overflow question for a really great answer, with a lot more detail about this: https://stackoverflow.com/questions/65289729/what-was-phps-o-serialization-format-for ---- Server IP: 45.112.84.4 Probable Submitter: 45.91.159.166 (proxied: 212.69.47.82) ---- Manual Page -- http://php.net/manual/en/migration74.incompatible.php Edit -- https://master.php.net/note/edit/125717 Del: integrated -- https://master.php.net/note/delete/125717/integrated Del: useless -- https://master.php.net/note/delete/125717/useless Del: bad code -- https://master.php.net/note/delete/125717/bad+code Del: spam -- https://master.php.net/note/delete/125717/spam Del: non-english -- https://master.php.net/note/delete/125717/non-english Del: in docs -- https://master.php.net/note/delete/125717/in+docs Del: other reasons-- https://master.php.net/note/delete/125717 Reject -- https://master.php.net/note/reject/125717 Search -- https://master.php.net/manage/user-notes.php