let
  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-unstable";
  pkgs = import nixpkgs { config = {}; overlays = []; };
in

pkgs.mkShellNoCC {
  packages = with pkgs; [
    php84
    php84Packages.composer
    php84Packages.php-cs-fixer
    php84Packages.php-codesniffer
  ];
}