Add a PHP 7.4 devshell

flake.lock

@@ -36,10 +36,27 @@
         "type": "github"
       }
     },
+    "nixpkgs-php74": {
+      "locked": {
+        "lastModified": 1651667340,
+        "narHash": "sha256-OUOe8zZ53ZlmATiNdhYkEIwbXAs9ZYrPhsRJwCS6VQI=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "81b77fd3847a2eb23618b7cbaa23049ba6139fa2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "81b77fd3847a",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-parts": "flake-parts",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-php74": "nixpkgs-php74"
       }
     }
   },

flake.nix

@@ -4,6 +4,8 @@
     flake-parts.url = "github:hercules-ci/flake-parts";
 
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    nixpkgs-php74.url = "github:nixos/nixpkgs/81b77fd3847a";
   };
 
   outputs =
@@ -13,6 +15,7 @@
 
       imports = [
         ./modules/nodejs.nix
+        ./modules/php74.nix
         ./modules/php81.nix
         ./modules/php82.nix
         ./modules/php83.nix

modules/php74.nix

@@ -0,0 +1,25 @@
+{ inputs, ... }:
+
+{
+  perSystem =
+    { pkgs, system, ... }:
+    let
+      pkgs-php74 = import inputs.nixpkgs-php74 { inherit system; };
+
+      php = pkgs-php74.php74;
+      phpPackages = pkgs-php74.php74Packages;
+    in
+    {
+      devShells.php74 = pkgs.mkShell {
+        packages = with pkgs; [
+          php
+          phpPackages.composer
+          phpactor
+        ];
+
+        shellHook = ''
+          php --version
+        '';
+      };
+    };
+}