diff --git a/reference/xml/examples.xml b/reference/xml/examples.xml
index ed939b6249..91fe9d1bae 100644
--- a/reference/xml/examples.xml
+++ b/reference/xml/examples.xml
@@ -15,9 +15,14 @@
 $file = "data.xml";
 $depth = array();
 
-function startElement($parser, $name, $attrs) 
+function startElement($parser, $name, $attrs)
 {
     global $depth;
+
+    if (!isset($depth[$parser])) {
+        $depth[$parser] = 0;
+    }
+
     for ($i = 0; $i < $depth[$parser]; $i++) {
         echo "  ";
     }
@@ -25,7 +30,7 @@ function startElement($parser, $name, $attrs)
     $depth[$parser]++;
 }
 
-function endElement($parser, $name) 
+function endElement($parser, $name)
 {
     global $depth;
     $depth[$parser]--;