symfony
diff --git a/‎src/Symfony/Component/DomCrawler/Crawler.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/DomCrawler/Crawler.php
+13-2Lines changed: 13 additions & 2 deletions b/‎src/Symfony/Component/DomCrawler/Crawler.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/DomCrawler/Crawler.php
+13-2Lines changed: 13 additions & 2 deletions
@@ -33,6 +33,11 @@ class Crawler implements \Countable, \IteratorAggregate
      */
     private $namespaces = [];
 
+    /**
+     * @var array A map of cached namespaces
+     */
+    private $cachedNamespaces = [];
+
     /**
      * @var string The base href value
      */
@@ -99,6 +104,7 @@ public function clear()
     {
         $this->nodes = [];
         $this->document = null;
+        $this->cachedNamespaces = $this->namespaces;
     }
 
     /**
@@ -968,6 +974,7 @@ public function setDefaultNamespacePrefix($prefix)
     public function registerNamespace($prefix, $namespace)
     {
         $this->namespaces[$prefix] = $namespace;
+        $this->cachedNamespaces[$prefix] = $namespace;
     }
 
     /**
@@ -1034,6 +1041,8 @@ private function filterRelativeXPath(string $xpath)
             $crawler->add($domxpath->query($xpath, $node));
         }
 
+        $crawler->cachedNamespaces = $this->cachedNamespaces;
+
         return $crawler;
     }
 
@@ -1235,6 +1244,7 @@ private function createDOMXPath(\DOMDocument $document, array $prefixes = []): \
             $namespace = $this->discoverNamespace($domxpath, $prefix);
             if (null !== $namespace) {
                 $domxpath->registerNamespace($prefix, $namespace);
+                $this->cachedNamespaces[$prefix] = $namespace;
             }
         }
 
@@ -1246,8 +1256,8 @@ private function createDOMXPath(\DOMDocument $document, array $prefixes = []): \
      */
     private function discoverNamespace(\DOMXPath $domxpath, string $prefix): ?string
     {
-        if (isset($this->namespaces[$prefix])) {
-            return $this->namespaces[$prefix];
+        if (isset($this->cachedNamespaces[$prefix])) {
+            return $this->cachedNamespaces[$prefix];
         }
 
         // ask for one namespace, otherwise we'd get a collection with an item for each node
@@ -1278,6 +1288,7 @@ private function createSubCrawler($nodes)
         $crawler->isHtml = $this->isHtml;
         $crawler->document = $this->document;
         $crawler->namespaces = $this->namespaces;
+        $crawler->cachedNamespaces = $this->cachedNamespaces;
         $crawler->html5Parser = $this->html5Parser;
 
         return $crawler;