diff -ru Amf.noref-writeString/Parse/Amf0/Serializer.php Amf.mod/Parse/Amf0/Serializer.php
--- Amf.noref-writeString/Parse/Amf0/Serializer.php	2009-11-12 10:26:19.000000000 -0600
+++ Amf.mod/Parse/Amf0/Serializer.php	2009-12-18 14:17:14.000000000 -0600
@@ -57,58 +57,9 @@
      * @return Zend_Amf_Parse_Amf0_Serializer
      * @throws Zend_Amf_Exception for unrecognized types or data
      */
-    public function writeTypeMarker($data, $markerType = null)
+    public function writeTypeMarker(&$data, $markerType = null)
     {
-        if (null !== $markerType) {
-            //try to refrence the given object
-            if( !$this->writeObjectReference($data, $markerType) ) {
-
-                // Write the Type Marker to denote the following action script data type
-                $this->_stream->writeByte($markerType);
-                switch($markerType) {
-                    case Zend_Amf_Constants::AMF0_NUMBER:
-                        $this->_stream->writeDouble($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_BOOLEAN:
-                        $this->_stream->writeByte($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_STRING:
-                        $this->_stream->writeUTF($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_OBJECT:
-                        $this->writeObject($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_NULL:
-                        break;
-                    case Zend_Amf_Constants::AMF0_REFERENCE:
-                        $this->_stream->writeInt($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_MIXEDARRAY:
-                        // Write length of numeric keys as zero.
-                        $this->_stream->writeLong(0);
-                        $this->writeObject($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_ARRAY:
-                        $this->writeArray($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_DATE:
-                        $this->writeDate($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_LONGSTRING:
-                        $this->_stream->writeLongUTF($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_TYPEDOBJECT:
-                        $this->writeTypedObject($data);
-                        break;
-                    case Zend_Amf_Constants::AMF0_AMF3:
-                        $this->writeAmf3TypeMarker($data);
-                        break;
-                    default:
-                        require_once 'Zend/Amf/Exception.php';
-                        throw new Zend_Amf_Exception("Unknown Type Marker: " . $markerType);
-                }
-            }
-        } else {
+        if (null === $markerType) {
             if(is_resource($data)) {
                 $data = Zend_Amf_Parse_TypeLoader::handleResource($data);
             }
@@ -168,9 +119,56 @@
                 default:
                     require_once 'Zend/Amf/Exception.php';
                     throw new Zend_Amf_Exception('Unsupported data type: ' . gettype($data));
+                    return;
             }
+        }
 
-            $this->writeTypeMarker($data, $markerType);
+        //try to refrence the given object
+        if( !$this->writeObjectReference($data, $markerType) ) {
+            // Write the Type Marker to denote the following action script data type
+            $this->_stream->writeByte($markerType);
+            switch($markerType) {
+                case Zend_Amf_Constants::AMF0_NUMBER:
+                    $this->_stream->writeDouble($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_BOOLEAN:
+                    $this->_stream->writeByte($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_STRING:
+                    $this->_stream->writeUTF($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_OBJECT:
+                    $this->writeObject($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_NULL:
+                    break;
+                case Zend_Amf_Constants::AMF0_REFERENCE:
+                    $this->_stream->writeInt($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_MIXEDARRAY:
+                    // Write length of numeric keys as zero.
+                    $this->_stream->writeLong(0);
+                    $this->writeObject($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_ARRAY:
+                    $this->writeArray($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_DATE:
+                    $this->writeDate($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_LONGSTRING:
+                    $this->_stream->writeLongUTF($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_TYPEDOBJECT:
+                    $this->writeTypedObject($data);
+                    break;
+                case Zend_Amf_Constants::AMF0_AMF3:
+                    $this->writeAmf3TypeMarker($data);
+                    break;
+                default:
+                    require_once 'Zend/Amf/Exception.php';
+                    throw new Zend_Amf_Exception("Unknown Type Marker: " . $markerType);
+            }
         }
         return $this;
     }
@@ -183,7 +181,7 @@
      * @param $markerType AMF type of the object to write
      * @return Boolean true, if the reference was written, false otherwise
      */
-    protected function writeObjectReference($object, $markerType){
+    protected function writeObjectReference(&$object, $markerType){
         if( $markerType == Zend_Amf_Constants::AMF0_OBJECT ||
             $markerType == Zend_Amf_Constants::AMF0_MIXEDARRAY ||
             $markerType == Zend_Amf_Constants::AMF0_ARRAY ||
@@ -208,10 +206,10 @@
      * @param object $data
      * @return Zend_Amf_Parse_Amf0_Serializer
      */
-    public function writeObject($object)
+    public function writeObject(&$object)
     {
         // Loop each element and write the name of the property.
-        foreach ($object as $key => $value) {
+        foreach ($object as $key => &$value) {
             // skip variables starting with an _ provate transient
             if( $key[0] == "_")    continue;
             $this->_stream->writeUTF($key);
@@ -231,7 +229,7 @@
      * @param array $array
      * @return Zend_Amf_Parse_Amf0_Serializer
      */
-    public function writeArray($array)
+    public function writeArray(&$array)
     {
         $length = count($array);
         if (!$length < 0) {
@@ -254,7 +252,7 @@
      * @param  DateTime|Zend_Date $data
      * @return Zend_Amf_Parse_Amf0_Serializer
      */
-    public function writeDate($data)
+    public function writeDate(&$data)
     {
         if ($data instanceof DateTime) {
             $dateString = $data->format('U');
@@ -281,7 +279,7 @@
      * @param  object $data
      * @return Zend_Amf_Parse_Amf0_Serializer
      */
-    public function writeTypedObject($data)
+    public function writeTypedObject(&$data)
     {
         $this->_stream->writeUTF($this->_className);
         $this->writeObject($data);
@@ -295,7 +293,7 @@
      * @param  string $data
      * @return Zend_Amf_Parse_Amf0_Serializer
      */
-    public function writeAmf3TypeMarker($data)
+    public function writeAmf3TypeMarker(&$data)
     {
         require_once 'Zend/Amf/Parse/Amf3/Serializer.php';
         $serializer = new Zend_Amf_Parse_Amf3_Serializer($this->_stream);
@@ -310,7 +308,7 @@
      * @param object $object
      * @return false|string $className
      */
-    protected function getClassName($object)
+    protected function getClassName(&$object)
     {
         require_once 'Zend/Amf/Parse/TypeLoader.php';
         //Check to see if the object is a typed object and we need to change
diff -ru Amf.noref-writeString/Parse/Amf3/Serializer.php Amf.mod/Parse/Amf3/Serializer.php
--- Amf.noref-writeString/Parse/Amf3/Serializer.php	2009-12-30 10:22:02.000000000 -0600
+++ Amf.mod/Parse/Amf3/Serializer.php	2009-12-30 10:20:32.000000000 -0600
@@ -37,6 +37,12 @@
 class Zend_Amf_Parse_Amf3_Serializer extends Zend_Amf_Parse_Serializer
 {
     /**
+     * A constant empty string
+     * @var string
+     */
+    protected $_strEmpty = '';
+
+    /**
      * An array of reference objects per amf body
      * @var array
      */
@@ -65,54 +71,15 @@
      * @param  int $markerType
      * @return void
      */
-    public function writeTypeMarker($data, $markerType=null)
+    public function writeTypeMarker(&$data, $markerType=null)
     {
-        if (null !== $markerType) {
-            // Write the Type Marker to denote the following action script data type
-            $this->_stream->writeByte($markerType);
-
-            switch ($markerType) {
-                case Zend_Amf_Constants::AMF3_NULL:
-                    break;
-                case Zend_Amf_Constants::AMF3_BOOLEAN_FALSE:
-                    break;
-                case Zend_Amf_Constants::AMF3_BOOLEAN_TRUE:
-                    break;
-                case Zend_Amf_Constants::AMF3_INTEGER:
-                    $this->writeInteger($data);
-                    break;
-                case Zend_Amf_Constants::AMF3_NUMBER:
-                    $this->_stream->writeDouble($data);
-                    break;
-                case Zend_Amf_Constants::AMF3_STRING:
-                    $this->writeString($data);
-                    break;
-                case Zend_Amf_Constants::AMF3_DATE:
-                    $this->writeDate($data);
-                    break;
-                case Zend_Amf_Constants::AMF3_ARRAY:
-                    $this->writeArray($data);
-                    break;
-                case Zend_Amf_Constants::AMF3_OBJECT:
-                    $this->writeObject($data);
-                    break;
-                case Zend_Amf_Constants::AMF3_BYTEARRAY:
-                    $this->writeByteArray($data);
-                    break;
-                case Zend_Amf_Constants::AMF3_XMLSTRING;
-                    $this->writeXml($data);
-                    break;
-                default:
-                    require_once 'Zend/Amf/Exception.php';
-                    throw new Zend_Amf_Exception('Unknown Type Marker: ' . $markerType);
-            }
-        } else {
+        if (null === $markerType) {
             // Detect Type Marker
             if(is_resource($data)) {
                 $data = Zend_Amf_Parse_TypeLoader::handleResource($data);
             }
-             switch (true) {
-                 case (null === $data):
+            switch (true) {
+                case (null === $data):
                     $markerType = Zend_Amf_Constants::AMF3_NULL;
                     break;
                 case (is_bool($data)):
@@ -153,8 +120,47 @@
                 default:
                     require_once 'Zend/Amf/Exception.php';
                     throw new Zend_Amf_Exception('Unsupported data type: ' . gettype($data));
-             }
-            $this->writeTypeMarker($data, $markerType);
+                    return;
+            }
+        }
+
+        // Write the Type Marker to denote the following action script data type
+        $this->_stream->writeByte($markerType);
+
+        switch ($markerType) {
+            case Zend_Amf_Constants::AMF3_NULL:
+                break;
+            case Zend_Amf_Constants::AMF3_BOOLEAN_FALSE:
+                break;
+            case Zend_Amf_Constants::AMF3_BOOLEAN_TRUE:
+                break;
+            case Zend_Amf_Constants::AMF3_INTEGER:
+                $this->writeInteger($data);
+                break;
+            case Zend_Amf_Constants::AMF3_NUMBER:
+                $this->_stream->writeDouble($data);
+                break;
+            case Zend_Amf_Constants::AMF3_STRING:
+                $this->writeString($data);
+                break;
+            case Zend_Amf_Constants::AMF3_DATE:
+                $this->writeDate($data);
+                break;
+            case Zend_Amf_Constants::AMF3_ARRAY:
+                $this->writeArray($data);
+                break;
+            case Zend_Amf_Constants::AMF3_OBJECT:
+                $this->writeObject($data);
+                break;
+            case Zend_Amf_Constants::AMF3_BYTEARRAY:
+                $this->writeByteArray($data);
+                break;
+            case Zend_Amf_Constants::AMF3_XMLSTRING;
+                $this->writeXml($data);
+                break;
+            default:
+                require_once 'Zend/Amf/Exception.php';
+                throw new Zend_Amf_Exception('Unknown Type Marker: ' . $markerType);
         }
     }
 
@@ -198,7 +204,7 @@
      * @param  string $string
      * @return Zend_Amf_Parse_Amf3_Serializer
      */
-    protected function writeBinaryString($string){
+    protected function writeBinaryString(&$string){
         $ref = strlen($string) << 1 | 0x01;
         $this->writeInteger($ref);
         $this->_stream->writeBytes($string);
@@ -212,7 +218,7 @@
      * @param  string $string
      * @return Zend_Amf_Parse_Amf3_Serializer
      */
-    public function writeString($string)
+    public function writeString(&$string)
     {
         $len = strlen($string);
         if(!$len){
@@ -238,7 +244,7 @@
      * @param  string|Zend_Amf_Value_ByteArray  $data
      * @return Zend_Amf_Parse_Amf3_Serializer
      */
-    public function writeByteArray($data){
+    public function writeByteArray(&$data){
         if($this->writeObjectReference($data)){
             return $this;
         }
@@ -263,7 +269,7 @@
      * @param  DOMDocument|SimpleXMLElement  $xml
      * @return Zend_Amf_Parse_Amf3_Serializer
      */
-    public function writeXml($xml)
+    public function writeXml(&$xml)
     {
         if($this->writeObjectReference($xml)){
             return $this;
@@ -291,7 +297,7 @@
      * @param  DateTime|Zend_Date $date
      * @return Zend_Amf_Parse_Amf3_Serializer
      */
-    public function writeDate($date)
+    public function writeDate(&$date)
     {
         if($this->writeObjectReference($date)){
             return $this;
@@ -318,16 +324,16 @@
      * @param array $array
      * @return Zend_Amf_Parse_Amf3_Serializer
      */
-    public function writeArray(array $array)
+    public function writeArray(&$array)
     {
         if($this->writeObjectReference($array)){
             return $this;
         }
 
-        // have to seperate mixed from numberic keys.
+        // have to seperate mixed from numeric keys.
         $numeric = array();
         $string  = array();
-        foreach ($array as $key => $value) {
+        foreach ($array as $key => &$value) {
             if (is_int($key)) {
                 $numeric[] = $value;
             } else {
@@ -341,14 +347,14 @@
         $this->writeInteger($id);
 
         //Write the mixed type array to the output stream
-        foreach($string as $key => $value) {
+        foreach($string as $key => &$value) {
             $this->writeString($key)
                  ->writeTypeMarker($value);
         }
-        $this->writeString('');
+        $this->writeString($this->_strEmpty);
 
         // Write the numeric array to ouput stream
-        foreach($numeric as $value) {
+        foreach($numeric as &$value) {
             $this->writeTypeMarker($value);
         }
         return $this;
@@ -361,7 +367,7 @@
      * @param mixed $object object to check for reference
      * @return Boolean true, if the reference was written, false otherwise
      */
-    protected function writeObjectReference($object){
+    protected function writeObjectReference(&$object){
         $ref = array_search($object, $this->_referenceObjects,true);
         //quickly handle object references
         if($ref !== false){
@@ -379,7 +385,7 @@
      * @param  mixed $data
      * @return Zend_Amf_Parse_Amf3_Serializer
      */
-    public function writeObject($object)
+    public function writeObject(&$object)
     {
         if($this->writeObjectReference($object)){
             return $this;
@@ -484,7 +490,7 @@
                     }
 
                     //Write an empty string to end the dynamic part
-                    $this->writeString('');
+                    $this->writeString($this->_strEmpty);
                     break;
                 case Zend_Amf_Constants::ET_EXTERNAL:
                     require_once 'Zend/Amf/Exception.php';
diff -ru Amf.noref-writeString/Parse/Serializer.php Amf.mod/Parse/Serializer.php
--- Amf.noref-writeString/Parse/Serializer.php	2009-11-12 10:26:19.000000000 -0600
+++ Amf.mod/Parse/Serializer.php	2009-12-18 14:13:08.000000000 -0600
@@ -55,5 +55,5 @@
      * @param  int $markerType
      * @return void
      */
-    public abstract function writeTypeMarker($content, $markerType=null);
+    public abstract function writeTypeMarker(&$content, $markerType=null);
 }