Replace static example element counter with class properties in Index and generic XHTML.
Add tests.
Refactor TestRender so that it can render multiple formats.
Co-authored-by: haszi <haszika80@gmail.com>
Closes https://github.com/php/doc-en/issues/3353.
When the list of `refentry`s (functions and methods) is retrieved from the indexing database the characters `_`, `::` and `->` in their names were replaced by `-` before storing them in the array `$ref` in `Format.php`. As this array is used to generate the links to and the index list of functions/methods, functions and methods with the same name after replacing the before mentioned characters (e.g. `finfo_buffer()`/`finfo::buffer()`, `finfo_file()`/`finfo::file()`, etc.) were overwriting each other's reference entries in memory (in the `$ref` array).
Fix this by not replacing the above listed characters.
Co-authored-by: haszi <haszika80@gmail.com>
haszi