Fix #4: extra ->children() should show for prefixed root element

src/simplexml_tree.php

@@ -124,11 +124,19 @@ function _simplexml_tree_recursively_process_node($item, $depth, $include_string
 	}
 
 	// To what namespace does this element belong? Returns array( alias => URI )
-	$item_ns = $item->getNamespaces(false);
-	if ( ! $item_ns )
+	// For top-level elements, cheat, and say they're in the null namespace, to force a ->children() call
+	if ( $depth == 1 )
 	{
 		$item_ns = array('' => NULL);
 	}
+	else
+	{
+		$item_ns = $item->getNamespaces(false);
+		if ( !$item_ns )
+		{
+			$item_ns = array('' => NULL);
+		}
+	}
 
 	// This returns all namespaces used by this node and all its descendants,
 	// 	whether declared in this node, in its ancestors, or in its descendants

tests/tree-output/basic-default-ns

@@ -1,18 +1,19 @@
 SimpleXML object (1 item)
 [0] // <movies>
-	->movie[0]
-		->title[0]
-		->characters[0]
-			->character[0]
-				->name[0]
-				->actor[0]
-			->character[1]
-				->name[0]
-				->actor[0]
-		->plot[0]
-		->great-lines[0]
-			->line[0]
-		->rating[0]
-			['type']
-		->rating[1]
-			['type']
+	->children('', true)
+		->movie[0]
+			->title[0]
+			->characters[0]
+				->character[0]
+					->name[0]
+					->actor[0]
+				->character[1]
+					->name[0]
+					->actor[0]
+			->plot[0]
+			->great-lines[0]
+				->line[0]
+			->rating[0]
+				['type']
+			->rating[1]
+				['type']