Fix xinclude destruction of live attributes

Follow-up for GH-17847 but now for attributes.

Closes GH-18100.

NEWS

@@ -10,6 +10,7 @@ PHP                                                                        NEWS
 
 - DOM:
   . Fix weird unpack behaviour in DOM. (nielsdos)
+  . Fix xinclude destruction of live attributes. (nielsdos)
 
 - GD:
   . Fixed bug GH-17984 (calls with arguments as array with references).

ext/dom/document.c

@@ -1607,14 +1607,28 @@ static zend_always_inline xmlNodePtr php_dom_next_in_tree_order(const xmlNode *n
 	}
 }
 
+static void dom_xinclude_strip_references_for_attributes(xmlNodePtr basep)
+{
+	for (xmlAttrPtr prop = basep->properties; prop; prop = prop->next) {
+		php_libxml_node_free_resource((xmlNodePtr) prop);
+		for (xmlNodePtr child = prop->children; child; child = child->next) {
+			php_libxml_node_free_resource(child);
+		}
+	}
+}
+
 static void dom_xinclude_strip_references(xmlNodePtr basep)
 {
 	php_libxml_node_free_resource(basep);
+	dom_xinclude_strip_references_for_attributes(basep);
 
 	xmlNodePtr current = basep->children;
 
 	while (current) {
 		php_libxml_node_free_resource(current);
+		if (current->type == XML_ELEMENT_NODE) {
+			dom_xinclude_strip_references_for_attributes(current);
+		}
 		current = php_dom_next_in_tree_order(current, basep);
 	}
 }

ext/dom/tests/gh17847.phpt

@@ -13,7 +13,7 @@ $doc->loadXML(<<<XML
     </xi:include>
     <xi:test xmlns:xi="http://www.w3.org/2001/XInclude">
       <xi:include href="thisisnonexistent">
-        <p>garbage</p>
+        <p attr="foo" attr2="bar">garbage</p>
       </xi:include>
     </xi:test>
 </root>
@@ -22,15 +22,22 @@ XML);
 $xpath = new DOMXPath($doc);
 
 $garbage = [];
-foreach ($xpath->query('//p') as $entry)
+foreach ($xpath->query('//p') as $entry) {
     $garbage[] = $entry;
+    foreach ($entry->attributes as $attr) {
+        $garbage[] = $attr;
+        foreach ($attr->childNodes as $child) {
+            $garbage[] = $child;
+        }
+    }
+}
 
 @$doc->xinclude();
 
 var_dump($garbage);
 ?>
 --EXPECT--
-array(3) {
+array(7) {
   [0]=>
   object(DOMElement)#3 (1) {
     ["schemaTypeInfo"]=>
@@ -46,4 +53,24 @@ array(3) {
     ["schemaTypeInfo"]=>
     NULL
   }
+  [3]=>
+  object(DOMAttr)#10 (2) {
+    ["specified"]=>
+    bool(true)
+    ["schemaTypeInfo"]=>
+    NULL
+  }
+  [4]=>
+  object(DOMText)#13 (0) {
+  }
+  [5]=>
+  object(DOMAttr)#12 (2) {
+    ["specified"]=>
+    bool(true)
+    ["schemaTypeInfo"]=>
+    NULL
+  }
+  [6]=>
+  object(DOMText)#15 (0) {
+  }
 }