perf: move sandboxed environment to the C side (#2058)

This PR uses `zend_array_dup` to simplify and optimize the environment sandboxing
logic. It also guarantees no environment leakage on FrankenPHP restarts.

caddy/caddy_test.go

@@ -61,6 +61,16 @@ func escapeMetricLabel(s string) string {
 	return strings.ReplaceAll(s, "\\", "\\\\")
 }
 
+func TestMain(m *testing.M) {
+	// setup custom environment vars for TestOsEnv
+	if os.Setenv("ENV1", "value1") != nil || os.Setenv("ENV2", "value2") != nil {
+		fmt.Println("Failed to set environment variables for tests")
+		os.Exit(1)
+	}
+
+	os.Exit(m.Run())
+}
+
 func TestPHP(t *testing.T) {
 	var wg sync.WaitGroup
 	tester := caddytest.NewTester(t)
@@ -957,9 +967,6 @@ func testSingleIniConfiguration(tester *caddytest.Tester, key string, value stri
 }
 
 func TestOsEnv(t *testing.T) {
-	require.NoError(t, os.Setenv("ENV1", "value1"))
-	require.NoError(t, os.Setenv("ENV2", "value2"))
-
 	tester := caddytest.NewTester(t)
 	tester.InitServer(`
 		{

caddy/mercure.go

@@ -5,13 +5,13 @@ package caddy
 import (
 	"encoding/json"
 	"errors"
-	"os"
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
 	"github.com/dunglas/frankenphp"
 	"github.com/dunglas/mercure"
 	mercureCaddy "github.com/dunglas/mercure/caddy"
+	"os"
 )
 
 func init() {
@@ -67,5 +67,5 @@ func createMercureRoute() (caddyhttp.Route, error) {
 		},
 	}
 
-	return mercureRoute, nil;
+	return mercureRoute, nil
 }

caddy/php-server.go

@@ -253,8 +253,8 @@ func cmdPHPServer(fs caddycmd.Flags) (int, error) {
 	if mercure {
 		mercureRoute, err := createMercureRoute()
 		if err != nil {
-        	return caddy.ExitCodeFailedStartup, err
-        }
+			return caddy.ExitCodeFailedStartup, err
+		}
 
 		subroute.Routes = append(caddyhttp.RouteList{mercureRoute}, subroute.Routes...)
 	}