References
Where the claims on this site come from. When a guide and a primary source disagree, the source wins — please open an issue.
Primary research
- Solving "includer's revenge" with PHP filter chains — loknop
The original writeup. Everything on this site about filter chains descends from it.
- php_filter_chain_generator — Synacktiv
The reference implementation and the published conversion table this site reproduces.
- PHP_INCLUDE_TO_SHELL_CHAR_DICT — wupco
The brute-forced iconv character dictionary the generator is built on.
- wrapwrap — Ambionics
Generalises the chain to prepend arbitrary data to any file a wrapper can read.