Allow Symfony 7.0

composer.json

@@ -21,13 +21,13 @@
     "ext-dom": "*",
     "ext-libxml": "*",
     "php-webdriver/webdriver": "^1.8.2",
-    "symfony/browser-kit": "^5.3 || ^6.0",
-    "symfony/dependency-injection": "^5.3 || ^6.0",
+    "symfony/browser-kit": "^5.3 || ^6.0 || ^7.0",
+    "symfony/dependency-injection": "^5.3 || ^6.0 || ^7.0",
     "symfony/deprecation-contracts": "^2.4 || ^3",
-    "symfony/dom-crawler": "^5.3 || ^6.0",
-    "symfony/http-client": "^5.3 || ^6.0",
-    "symfony/http-kernel": "^5.3 || ^6.0",
-    "symfony/process": "^5.3 || ^6.0"
+    "symfony/dom-crawler": "^5.3 || ^6.0 || ^7.0",
+    "symfony/http-client": "^5.3 || ^6.0 || ^7.0",
+    "symfony/http-kernel": "^5.3 || ^6.0 || ^7.0",
+    "symfony/process": "^5.3 || ^6.0 || ^7.0"
   },
   "autoload": {
     "psr-4": { "Symfony\\Component\\Panther\\": "src/" }
@@ -44,9 +44,9 @@
     "sort-packages": true
   },
   "require-dev": {
-    "symfony/css-selector": "^5.3 || ^6.0",
-    "symfony/framework-bundle": "^5.3 || ^6.0",
-    "symfony/mime": "^5.3 || ^6.0",
-    "symfony/phpunit-bridge": "^5.3 || ^6.0"
+    "symfony/css-selector": "^5.3 || ^6.0 || ^7.0",
+    "symfony/framework-bundle": "^5.3 || ^6.0 || ^7.0",
+    "symfony/mime": "^5.3 || ^6.0 || ^7.0",
+    "symfony/phpunit-bridge": "^5.3 || ^6.0 || ^7.0"
   }
 }

src/DomCrawler/Crawler.php

@@ -188,14 +188,14 @@ public function children(string $selector = null): static
         return $this->createSubCrawlerFromXpath($xpath);
     }
 
-    public function attr($attribute): ?string
+    public function attr($attribute, $default = null): ?string
     {
         $element = $this->getElementOrThrow();
         if ('_text' === $attribute) {
             return $this->text();
         }
 
-        return (string) $element->getAttribute($attribute);
+        return $element->getAttribute($attribute) ?? $default;
     }
 
     public function nodeName(): string