php: Add nixos test to ensure php-pcre works in httpd

nixos/release-combined.nix

···
         (all nixos.tests.nfs3)
         (all nixos.tests.nfs4)
         (all nixos.tests.openssh)
+        (all nixos.tests.php-pcre)
         (all nixos.tests.printing)
         (all nixos.tests.proxy)
         (all nixos.tests.sddm.default)

nixos/release.nix

···
   tests.pam-oath-login = callTest tests/pam-oath-login.nix {};
   #tests.panamax = hydraJob (import tests/panamax.nix { system = "x86_64-linux"; });
   tests.peerflix = callTest tests/peerflix.nix {};
+  tests.php-pcre = callTest tests/php-pcre.nix {};
   tests.postgresql = callSubTests tests/postgresql.nix {};
   tests.pgmanage = callTest tests/pgmanage.nix {};
   tests.postgis = callTest tests/postgis.nix {};

nixos/tests/php-pcre.nix

···
+
+let testString = "can-use-subgroups"; in
+
+import ./make-test.nix ({ pkgs, ...}: {
+  name = "php-httpd-pcre-jit-test";
+  machine = { config, lib, pkgs, ... }: {
+    time.timeZone = "UTC";
+    services.httpd = {
+      enable = true;
+      adminAddr = "[e-mail]";
+      extraSubservices = lib.singleton {
+        function = f: {
+          enablePHP = true;
+          phpOptions = "pcre.jit = true";
+
+          extraConfig =
+          let
+            testRoot = pkgs.writeText "index.php"
+            ''
+              <?php
+                preg_match('/(${testString})/', '${testString}', $result);
+                var_dump($result);
+              ?>
+            '';
+          in
+            ''
+              Alias / ${testRoot}/
+
+              <Directory ${testRoot}>
+                Require all granted
+              </Directory>
+            '';
+        };
+      };
+    };
+  };
+  testScript = { nodes, ... }:
+  ''
+    $machine->waitForUnit('httpd.service');
+    # Ensure php evaluation by matching on the var_dump syntax
+    $machine->succeed('curl -vvv -s http://127.0.0.1:80/index.php \
+      | grep "string(${toString (builtins.stringLength testString)}) \"${testString}\""');
+  '';
+})

pkgs/development/interpreters/php/default.nix

···
           configureFlags = [ "--enable-pcntl" ];
         };
 
+        # pcre functionality is tested in nixos/tests/php-pcre.nix
         pcre = {
           configureFlags = ["--with-pcre-regex=${pcre.dev} PCRE_LIBDIR=${pcre}"];
           buildInputs = [ pcre ];