To contribute other shells not listed here... Fork, Push the changes to your repo, then before you request for a Pull, make sure to include a simple description of your php web-shell and include a screen-shot of the web-shell (as hosted in your localhost).

Common PHP shells. Do not put these on a publicly-accessible webserver.

These are provided for education purposes only.

Common php webshells. Do not host the file(s) in your server!

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Though I recommend one-liners like

(Not a full fledged webshell, but works fine)

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You can try WebHandler for one-liners.

WebHandler.py works for POST and GET requests: