Unit tests are happy. Have you had a chance to review changes between 8 and 9? I haven't yet done so to see if there are any breaking changes that need to be addressed.

phpstan reports the same warnings with both 8 and 9. They should probably be fixed regardless. The signatures are the same, so I imagine they are compatible.

I'm hesitant to fix these, though, because you're still supporting PHP 7.1, and maintaining compatibility with that is awkward. If yo ever release a new version, I'd recommend rector and updating to only supported versions of php.

Very low priority, I just noticed the new version of that library.

phpstan analyze src
29/29 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%

Line Svg/Style.php

89 Method Svg\Style::fromAttributes() should return Svg\Style but return statement is missing.
🪪 return.missing
91 Method Svg\Style::fromAttributes() should return Svg\Style but return statement is missing.
🪪 return.missing

Line Svg/Surface/CPdf.php

1109 Undefined variable: $object
🪪 variable.undefined
1111 Undefined variable: $object
🪪 variable.undefined
3624 Call to vsprintf contains 3 placeholders, 4 values given.
🪪 argument.vsprintf
3663 Call to vsprintf contains 3 placeholders, 4 values given.
🪪 argument.vsprintf

Line Svg/Surface/SurfaceCpdf.php

220 Call to an undefined method Svg\Surface\SurfaceCpdf::_convert_gif_bmp_to_png().
🪪 method.notFound

Unit tests are happy. Have you had a chance to review changes between 8 and 9? I haven't yet done so to see if there are any breaking changes that need to be addressed.

The only potentially breaking change is MyIntervals/PHP-CSS-Parser#1194. It is unlikely to be breaking, but since it changed the class hierarchy, we considered it worthy of a new major release, just in case.

You can allow v8 or v9 in composer.json. I hope you can resolve this soon - we have had a PR attempting to add PHP 8.5 support to the 8.x branch which is no longer supported. The 9.x version is compatible with PHP from 7.2, which should be sufficient.

Thank you for the information. I do plan to start reviewing changes for the next release of SvgLib i the near future.