Add Dom\DocumentFragment::getElementById()

ext/dom/document.c

@@ -1032,7 +1032,7 @@ PHP_METHOD(DOMDocument, getElementById)
 	char *idname;
 
 	ZEND_PARSE_PARAMETERS_START(1, 1)
-		Z_PARAM_STRING(idname, idname_len)
+		Z_PARAM_PATH(idname, idname_len)
 	ZEND_PARSE_PARAMETERS_END();
 
 	DOM_GET_OBJ(docp, ZEND_THIS, xmlDocPtr, intern);
@@ -1051,20 +1051,10 @@ PHP_METHOD(DOMDocument, getElementById)
 		 * the element the ID is actually removed by libxml2. Since libxml2 has such behaviour deeply
 		 * ingrained in the library, and uses the cache for various purposes, it seems like a bad
 		 * idea and lost cause to fight it. */
-
 		const xmlNode *base = (const xmlNode *) docp;
-		const xmlNode *node = base->children;
-		while (node != NULL) {
-			if (node->type == XML_ELEMENT_NODE) {
-				for (const xmlAttr *attr = node->properties; attr != NULL; attr = attr->next) {
-					if (attr->atype == XML_ATTRIBUTE_ID && dom_compare_value(attr, BAD_CAST idname)) {
-						DOM_RET_OBJ((xmlNodePtr) node, intern);
-						return;
-					}
-				}
-			}
-
-			node = php_dom_next_in_tree_order(node, base);
+		xmlNodePtr node = dom_scan_id(base, BAD_CAST idname);
+		if (node) {
+			DOM_RET_OBJ(node, intern);
 		}
 	}
 }

ext/dom/documentfragment.c

@@ -93,4 +93,23 @@ PHP_METHOD(DOMDocumentFragment, appendXML) {
 }
 /* }}} */
 
+PHP_METHOD(Dom_DocumentFragment, getElementById)
+{
+	xmlNodePtr base;
+	size_t idname_len;
+	dom_object *intern;
+	char *idname;
+
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_PATH(idname, idname_len)
+	ZEND_PARSE_PARAMETERS_END();
+
+	DOM_GET_OBJ(base, ZEND_THIS, xmlNodePtr, intern);
+
+	xmlNodePtr node = dom_scan_id(base, BAD_CAST idname);
+	if (node) {
+		DOM_RET_OBJ(node, intern);
+	}
+}
+
 #endif

ext/dom/php_dom.c

@@ -2720,4 +2720,22 @@ xmlDocPtr php_dom_create_html_doc(void)
 	return lxml_doc;
 }
 
+xmlNodePtr dom_scan_id(const xmlNode *base, const xmlChar *idname)
+{
+	xmlNodePtr node = base->children;
+	while (node != NULL) {
+		if (node->type == XML_ELEMENT_NODE) {
+			for (const xmlAttr *attr = node->properties; attr != NULL; attr = attr->next) {
+				if (attr->atype == XML_ATTRIBUTE_ID && dom_compare_value(attr, BAD_CAST idname)) {
+					return node;
+				}
+			}
+		}
+
+		node = php_dom_next_in_tree_order(node, base);
+	}
+
+	return NULL;
+}
+
 #endif /* HAVE_DOM */

ext/dom/php_dom.h

@@ -158,6 +158,7 @@ bool php_dom_create_nullable_object(xmlNodePtr obj, zval *return_value, dom_obje
 xmlNodePtr dom_clone_node(php_dom_libxml_ns_mapper *ns_mapper, xmlNodePtr node, xmlDocPtr doc, bool recursive);
 void dom_set_document_ref_pointers(xmlNodePtr node, php_libxml_ref_obj *document);
 void dom_set_document_ref_pointers_attr(xmlAttrPtr attr, php_libxml_ref_obj *document);
+xmlNodePtr dom_scan_id(const xmlNode *base, const xmlChar *idname);
 
 /* Prop getters by offset */
 zval *dom_get_prop_checked_offset(dom_object *obj, uint32_t offset, const char *name);

ext/dom/php_dom.stub.php

@@ -1899,6 +1899,8 @@ public function replaceChildren(Node|string ...$nodes): void {}
         public function querySelector(string $selectors): ?Element {}
         /** @implementation-alias Dom\Element::querySelectorAll */
         public function querySelectorAll(string $selectors): NodeList {}
+
+        public function getElementById(string $elementId): ?Element {}
     }
 
     class Entity extends Node