On Tue, Mar 22, 2022 at 05:45:47PM +0000, Cheshire Yang wrote:
> Hi all,
> 
> I need help setting up emacs as a PHP IDE. I'm using Emacs 27 on NixOS.
> 
> First, it should be noted that MELPA works for me _very_ inconsistently, though the configuration and everything looks fine. I was not able to connect to MELPA today, so I cloned lsp-mode repository from github into .emacs.d/ and loaded it in the init file. So now, I can open a PHP file and M-x lsp-mode with success. I also installed Intelephense on the operating system, through the OS package manager (nix), and confirmed that I can type `intelephense` into a terminal and the command is available.
> 
> When I run `M-x lsp` to start the server however, I get a strange error. This is the output with toggle debug on error:
> 
> Debugger entered--Lisp error: (void-function -andfn)

That means that some "-andfn" is missing. My hunch is that this is
part of "dash.el", a collection of functional-style bells-and-whistles.
Probably you need to install that (watch out: perhaps lsp-mode has
other dependencies you need to install).

Dash.el would be available through (m)elpa.

Cheers
-- 
t