phpPackages: Move phpPackages to php.packages

This means php packages can now refer to other php packages by looking
them up in the php.packages attribute and gets rid of the internal
recursive set previously defined in php-packages.nix. This also means
that in applications where previously both the php package and the
corresponding version of the phpPackages package set had to be
specified, the php package will now suffice.

This also adds the phpWithExtensions parameter to the
php-packages.nix, which can be used by extensions that need a fully
featured PHP executable.

pkgs/development/interpreters/php/default.nix

@@ -144,13 +144,17 @@ let
     };
   };
 
-  generic' = { version, sha256, ... }@args:
+  generic' = { version, sha256, self, selfWithExtensions, ... }@args:
     let
-      php = generic args;
+      php = generic (builtins.removeAttrs args [ "self" "selfWithExtensions" ]);
+      packages = callPackage ../../../top-level/php-packages.nix {
+        php = self;
+        phpWithExtensions = selfWithExtensions;
+      };
       buildEnv = { exts ? (_: []), extraConfig ? "" }:
         let
           getExtName = ext: lib.removePrefix "php-" (builtins.parseDrvName ext.name).name;
-          extList = exts (callPackage ../../../top-level/php-packages.nix { inherit php; });
+          extList = exts packages;
 
           # Generate extension load configuration snippets from
           # exts. This is an attrset suitable for use with
@@ -182,7 +186,9 @@ let
             name = "php-with-extensions-${version}";
             inherit version;
             nativeBuildInputs = [ makeWrapper ];
-            passthru.buildEnv = buildEnv;
+            passthru = {
+              inherit buildEnv packages;
+            };
             paths = [ php ];
             postBuild = ''
               wrapProgram $out/bin/php \
@@ -193,12 +199,16 @@ let
           };
     in
       php.overrideAttrs (_: {
-        passthru.buildEnv = buildEnv;
+        passthru = {
+          inherit buildEnv packages;
+        };
       });
 
   php72base = generic' {
     version = "7.2.28";
     sha256 = "18sjvl67z5a2x5s2a36g6ls1r3m4hbrsw52hqr2qsgfvg5dkm5bw";
+    self = php72base;
+    selfWithExtensions = php72;
 
     # https://bugs.php.net/bug.php?id=76826
     extraPatches = lib.optional stdenv.isDarwin ./php72-darwin-isfinite.patch;
@@ -207,6 +217,8 @@ let
   php73base = generic' {
     version = "7.3.15";
     sha256 = "0g84hws15s8gh8iq4h6q747dyfazx47vh3da3whz8d80x83ibgld";
+    self = php73base;
+    selfWithExtensions = php73;
 
     # https://bugs.php.net/bug.php?id=76826
     extraPatches = lib.optional stdenv.isDarwin ./php73-darwin-isfinite.patch;
@@ -215,6 +227,8 @@ let
   php74base = generic' {
     version = "7.4.3";
     sha256 = "wVF7pJV4+y3MZMc6Ptx21PxQfEp6xjmYFYTMfTtMbRQ=";
+    self = php74base;
+    selfWithExtensions = php74;
   };
 
   defaultPhpExtensions = {
@@ -226,10 +240,11 @@ let
       tokenizer xmlreader xmlwriter zip zlib
     ] ++ lib.optionals (!stdenv.isDarwin) [ imap ]);
   };
-in {
-  inherit php72base php73base php74base;
 
   php74 = php74base.buildEnv defaultPhpExtensions;
   php73 = php73base.buildEnv defaultPhpExtensions;
   php72 = php72base.buildEnv defaultPhpExtensions;
+
+in {
+  inherit php72base php73base php74base php72 php73 php74;
 }