AMFPHP issue referencing ByteArray

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class Service
{
public function getArray( )
{
$GLOBALS['amfphp']['encoding'] = 'amf3';
$a = new ByteArray("\x00\x10this is a string");
$b = new ByteArray("\x00\x16this is another string");
$c = $a;
return array( $a, $b, $c );
}
}

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package
{
    import flash.display.Sprite;
    import flash.net.NetConnection;
    import flash.net.ObjectEncoding;
    import flash.net.Responder;
    import flash.utils.ByteArray;

    public class test extends Sprite
    {
        private var nc: NetConnection;
        private var rsp: Responder;

        public function test()
        {
            rsp = new Responder( onResult, null );
            nc = new NetConnection();
            nc.objectEncoding = ObjectEncoding.AMF3;
            nc.connect( "http://localhost/amfphp/trunk/gateway.php" );
            nc.call( "test.bytearray.Service.getArray", rsp );
        }

        private function onResult( e: * ): void
        {
            if ( e is Array )
            {
                for each ( var b: ByteArray in( e as Array ) )
                {
                    trace( 'reading bytearray...' );
                    b.position = 0;
                    trace( b.readUTF() );
                }
            }
        }
    }
}

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patch -p0 -i bytearray.patch

AMFPHP and mbstring

Persuasive Piece With PHP 5.2.4 installed both on local and remote server, the local amfphp works and the remote gave errors.

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if(!$handled)
{
$uriclasspath = "amfphp/Amf3Broker.php";
$classpath = $baseClassPath . "amfphp/Amf3Broker.php";
$classname = "Amf3Broker";
$methodname = "handleMessage";
}

So at the end I discovered that amfphp didn’t deserialize the amf data correctly! All the packet were corrupted (that’s why $messageType wasn’t handled), all the strings were not correctly parsed.
Finally I discovered the reason. It’s because mbstring.
The only difference between the remote server and the local server is the php.ini setting about mbstring overload and the others mbstring settings.
The remote server has mbstring.func_overload = 2, that means all the strings functions are affected and that’s why the amfphp methods were returing corrupted data.
In fact I just changed this method into AMFDeserializer.php:

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function readBuffer($len)
{
$data = substr($this->raw_data,$this->current_byte,$len);
$this->current_byte += $len;
return $data;
}

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function readBuffer($len)
{
$data = "";
for($i = 0; $i < $len; $i++)
{
$data .= $this->raw_data{$i + $this->current_byte};
}
$this->current_byte += $len;
return $data;
}

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