Create custom functions like nullable_htmlspecialchars and do a straight-forward find and replace in your code.
Depending how many cases you have, you may be able to just fix them manually a few at a time, either adding ? '' or fixing a logic bug where you weren't expecting a null anyway.For instance, htmlspecialchars($something) can be replaced with htmlspecialchars($something ? '') The quick fix in most cases is to use the null coalescing operator to provide a default value as appropriate, so you don't need a long null check around every use.So, don't panic that not everything is fixed right away, and be patient with library maintainers, who will get to this in their own time. The purpose of deprecation is to give authors advance notice to fix their code, so you and the authors of libraries you use have until PHP 9.0 comes out to fix things. PHP 8.1 deprecates these calls, it does not make them errors.
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