Fix php8.2 deprecation: preg_match():

-  Passing null to parameter laravel#2 ($subject) of type string is deprecated

Author: tivvie

src/Illuminate/Routing/UrlGenerator.php

@@ -674,6 +674,10 @@ public function format($root, $path, $route = null)
      */
     public function isValidUrl($path)
     {
+        if ($path === null) {
+            return false;
+        }
+
         if (! preg_match('~^(#|//|https?://|(mailto|tel|sms):)~', $path)) {
             return filter_var($path, FILTER_VALIDATE_URL) !== false;
         }

tests/Routing/RoutingUrlGeneratorTest.php

@@ -2001,6 +2001,17 @@ public function testUrlGenerationWithOptionalParameters(): void
             $url->route('tenantPostUserOptionalMethod', ['concreteTenant', 'concretePost', 'concreteUser', 'concreteMethod']),
         );
     }
+
+    public function testIsValidUrlPathIsNull()
+    {
+        $url = new UrlGenerator(
+            $routes = new RouteCollection,
+            Request::create('https://www.foo.com/')
+        );
+
+        $this->assertSame(false, $url->isValidUrl(null));
+    }
+
 }
 
 class RoutableInterfaceStub implements UrlRoutable