> For the complete documentation index, see [llms.txt](https://ps.desdes.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ps.desdes.xyz/insecure-deserialization/lab-developing-a-custom-gadget-chain-for-php-deserialization.md).

# Lab: Developing a custom gadget chain for PHP deserialization

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