add parameter allowing node to be exported into existing Document context

add test
fix warnings

ext/xmlreader/php_xmlreader.c

@@ -1180,12 +1180,22 @@ Moves the position of the current instance to the next node in the stream. */
 PHP_METHOD(xmlreader, expand)
 {
 #ifdef HAVE_DOM
-	zval *id, *rv = NULL;
+	zval *id, *rv = NULL, *basenode = NULL;
 	int ret;
 	xmlreader_object *intern;
 	xmlNode *node, *nodec;
+	xmlDocPtr docp = NULL;
+	php_libxml_node_object *domobj = NULL;
+
+	if (zend_parse_method_parameters(ZEND_NUM_ARGS() TSRMLS_CC, getThis(), "O|O!", &id, xmlreader_class_entry, &basenode, dom_node_class_entry) == FAILURE) {
+		return;
+	}
+	
+	if (basenode != NULL) {
+		NODE_GET_OBJ(node, basenode, xmlNodePtr, domobj);
+		docp = node->doc;
+	}
 
-	id = getThis();
 	intern = (xmlreader_object *)zend_object_store_get_object(id TSRMLS_CC);
 
 	if (intern && intern->ptr) {
@@ -1195,12 +1205,12 @@ PHP_METHOD(xmlreader, expand)
 			php_error_docref(NULL TSRMLS_CC, E_WARNING, "An Error Occured while expanding");
 			RETURN_FALSE;
 		} else {
-			nodec = xmlCopyNode(node, 1);
+			nodec = xmlDocCopyNode(node, docp, 1);
 			if (nodec == NULL) {
 				php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Cannot expand this node type");
 				RETURN_FALSE;
 			} else {
-				DOM_RET_OBJ(rv, nodec, &ret, NULL);
+				DOM_RET_OBJ(rv, nodec, &ret, (dom_object *)domobj);
 			}
 		}
 	} else {

ext/xmlreader/tests/expand.phpt

@@ -0,0 +1,37 @@
+--TEST--
+XMLReader: Expand into existing DOM documet
+--SKIPIF--
+<?php if (!extension_loaded("xmlreader")) print "skip";
+if (!extension_loaded("dom")) print "skip";
+$reader = new XMLReader();
+if (!method_exists($reader, 'expand')) print "skip";
+?>
+--FILE--
+<?php 
+
+$basexml = '<?xml version="1.0" encoding="UTF-8"?>
+<books><book>base book</book></books>';
+
+$xmlstring = '<?xml version="1.0" encoding="UTF-8"?>
+<books><book>new book</book></books>';
+
+$dom = new DOMDocument();
+$dom->loadXML($basexml);
+
+$reader = new XMLReader();
+$reader->XML($xmlstring);
+while ($reader->read()) {
+    if ($reader->localName == "book") {
+        $node = $reader->expand($dom);
+        if ($node->ownerDocument) {
+            echo $node->ownerDocument->documentElement->firstChild->textContent . "\n";
+        }
+        break;
+    }
+}
+$reader->close();
+?>
+===DONE===
+--EXPECT--
+base book
+===DONE===