Merge branch '4.4' into 5.4

* 4.4:
  [VarDumper] Fix dumping mysqli_driver instances
  Fix missing ReturnTypeWillChange attributes
  [Cache] Add missing log when saving namespace
  [HttpKernel] Reset services between requests performed by KernelBrowser
  [HttpKernel] Remove unused argument in ArgumentMetadataFactory

Author: nicolas-grekas

KernelBrowser.php

@@ -22,6 +22,7 @@
 use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\HttpKernel\Profiler\Profile as HttpProfile;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Contracts\Service\ResetInterface;
 
 /**
  * Simulates a browser and makes requests to a Kernel object.
@@ -167,7 +168,12 @@ protected function doRequest(object $request)
         // avoid shutting down the Kernel if no request has been performed yet
         // WebTestCase::createClient() boots the Kernel but do not handle a request
         if ($this->hasPerformedRequest && $this->reboot) {
+            $container = $this->kernel->getContainer();
             $this->kernel->shutdown();
+
+            if ($container instanceof ResetInterface) {
+                $container->reset();
+            }
         } else {
             $this->hasPerformedRequest = true;
         }
@@ -218,7 +224,7 @@ protected function getScript(object $request)
 
         $requires = '';
         foreach (get_declared_classes() as $class) {
-            if (0 === strpos($class, 'ComposerAutoloaderInit')) {
+            if (str_starts_with($class, 'ComposerAutoloaderInit')) {
                 $r = new \ReflectionClass($class);
                 $file = \dirname($r->getFileName(), 2).'/autoload.php';
                 if (is_file($file)) {

Tests/KernelBrowserTest.php

@@ -54,7 +54,7 @@ public function testEnableRebootKernel()
     private function getKernelMock()
     {
         $mock = $this->getMockBuilder($this->getKernelClass())
-            ->setMethods(['shutdown', 'boot', 'handle'])
+            ->setMethods(['shutdown', 'boot', 'handle', 'getContainer'])
             ->disableOriginalConstructor()
             ->getMock();