php: fix infinite recursion with overrideAttrs

pkgs/development/interpreters/php/generic.nix

@@ -399,9 +399,15 @@ let
                 newPhpAttrsOverrides = lib.composeExtensions (lib.toExtension phpAttrsOverrides) (
                   lib.toExtension f
                 );
-                php = generic (args // { phpAttrsOverrides = newPhpAttrsOverrides; });
+                phpOverridden = finalAttrs.overrideAttrs f;
               in
-              php;
+              phpOverridden
+              // {
+                passthru = phpOverridden.passthru // {
+                  buildEnv = mkBuildEnv { phpAttrsOverrides = newPhpAttrsOverrides; } [ ];
+                  withExtensions = mkWithExtensions { phpAttrsOverrides = newPhpAttrsOverrides; } [ ];
+                };
+              };
             inherit ztsSupport;
 
             services.default = {

pkgs/test/php/default.nix

@@ -2,6 +2,8 @@
   lib,
   php,
   runCommand,
+  stdenv,
+  stdenvAdapters,
 }:
 
 let
@@ -96,6 +98,26 @@ in
       ${check (builtins.match ".*oAs-second.*" customPhp.postInstall != null)}
     '';
 
+  # Regression test for https://github.com/NixOS/nixpkgs/issues/509863:
+  # wrapping php's stdenv with an adapter that uses `extendMkDerivationArgs`
+  # (e.g. `keepDebugInfo`) used to trigger an infinite recursion via the
+  # custom `passthru.overrideAttrs` defined for unwrapped php. Forcing the
+  # derivation here would stack-overflow before the fix; checking
+  # `dontStrip` also confirms the adapter actually applied.
+  stdenvAdapter-keepDebugInfo-does-not-recurse =
+    let
+      customPhp = php.override {
+        stdenv = stdenvAdapters.keepDebugInfo stdenv;
+      };
+    in
+    runTest "php-test-stdenvAdapter-keepDebugInfo-does-not-recurse" ''
+      checking "if the override evaluates without infinite recursion"
+      ${check (builtins.isString customPhp.unwrapped.drvPath)}
+
+      checking "if keepDebugInfo's dontStrip propagated to the unwrapped derivation"
+      ${check (customPhp.unwrapped.dontStrip or false)}
+    '';
+
   wrapped-overrideAttrs-stacks =
     let
       customPhp = lib.pipe php [