Merge branch '6.3' into 6.4

* 6.3:
  fix merge
  [VarDumper] Test intl formatter broken since dumper does not replace the nnbsp character by standard space
  [WebProfilerBundle] Fix intercept external redirects
  [Webhook] Added missing XML attribute in config XSD
  [String] Skip a test when an issue is detected in PCRE2
  [ExpressionLanguage] Fix null coalescing propagation
  [Mailer] Stop using the (local) AWS shared configuration in the PHPUnit tests.
  detect colors on not windows
  fix xterm detection
  refactor: hyper check
  Missing translations for Slovak (sk) #51954
  Remove redundant PHPdoc line
  properly handle SYMFONY_DOTENV_VARS being the empty string
  Avoid incompatibility with symfony/console 7
  bug #45057 [Messenger] Avoid reconnecting active Redis connections.
  [HttpKernel] Catch `TypeError` if the wrong type is used in `BackedEnumValueResolver`
  [Serializer] fix regression where nullable int cannot be serialized
  do not overwrite an application's default serialization context

Author: xabbuh

Command/DebugCommand.php

@@ -151,7 +151,13 @@ private function getVariables(array $envFiles, ?string $nameFilter): array
 
     private function getAvailableVars(): array
     {
-        $vars = explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? '');
+        $dotenvVars = $_SERVER['SYMFONY_DOTENV_VARS'] ?? '';
+
+        if ('' === $dotenvVars) {
+            return [];
+        }
+
+        $vars = explode(',', $dotenvVars);
         sort($vars);
 
         return $vars;

Tests/Command/DebugCommandTest.php

@@ -27,6 +27,8 @@ class DebugCommandTest extends TestCase
      */
     public function testErrorOnUninitializedDotenv()
     {
+        unset($_SERVER['SYMFONY_DOTENV_VARS']);
+
         $command = new DebugCommand('dev', __DIR__.'/Fixtures/Scenario1');
         $command->setHelperSet(new HelperSet([new FormatterHelper()]));
         $tester = new CommandTester($command);
@@ -36,6 +38,30 @@ public function testErrorOnUninitializedDotenv()
         $this->assertStringContainsString('[ERROR] Dotenv component is not initialized', $output);
     }
 
+    /**
+     * @runInSeparateProcess
+     */
+    public function testEmptyDotEnvVarsList()
+    {
+        $_SERVER['SYMFONY_DOTENV_VARS'] = '';
+
+        $command = new DebugCommand('dev', __DIR__.'/Fixtures/Scenario1');
+        $command->setHelperSet(new HelperSet([new FormatterHelper()]));
+        $tester = new CommandTester($command);
+        $tester->execute([]);
+        $expectedFormat = <<<'OUTPUT'
+%a
+ ---------- ------- ------------ ------%S
+  Variable   Value   .env.local   .env%S
+ ---------- ------- ------------ ------%S
+
+ // Note that values might be different between web and CLI.%S
+%a
+OUTPUT;
+
+        $this->assertStringMatchesFormat($expectedFormat, $tester->getDisplay());
+    }
+
     public function testScenario1InDevEnv()
     {
         $output = $this->executeCommand(__DIR__.'/Fixtures/Scenario1', 'dev');