flake.nix

{
  description = "ufff";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    phps.url = "github:loophp/nix-shell";
    systems.url = "github:nix-systems/default";
  };

  outputs = inputs@{ self, flake-parts, systems, ... }:

    flake-parts.lib.mkFlake { inherit inputs; } {
      systems = import systems;

      perSystem = { pkgs, system, ... }: {
        pkgs = import inputs.nixpkgs {
          inherit system;
          overlays = [ inputs.phps.overlays.default ];
        };
        # Run `nix fmt` to reformat the nix files
        formatter = pkgs.nixfmt;

        devShells.default = pkgs.mkShellNoCC {
          name = "ufff";

          buildInputs = [ pkgs.php-env82 pkgs.sphinx (pkgs.python3.withPackages (p: with p; [ sphinx-rtd-theme ])) ];
        };
      };
    };
}

This is the resulting error:

       error: attribute 'api' missing

       at /nix/store/dhfg509620jwb0g4v83vxnrlphz3l6by-source/flake.nix:27:17:

           26|         phps = map
           27|           (php: pkgs.api.buildPhpFromComposer { inherit php; src = inputs.self; })