Syntax error in xml-writer

Question

I have seen an example of an XML-writer in another quistion:

<?php 
           $writer = new XMLWriter();   
           $writer->openURI('php://output');    
           $writer->startDocument('1.0','UTF-8');    
           $writer->setIndent(4);    
           $writer->startElement('items');   
           $writer->startElement("main");   
           $writer->writeElement('user_id', 3);   
           $writer->writeElement('msg_count', 11);   
           $writer->endElement();    
           $writer->startElement("msg");   
           $writer->writeAttribute('category', 'test');   
           $writer->endElement();      
           $writer->endElement();    
           $writer->endDocument();    
           $writer->flush();  
    ?> 

But I get an syntaxerror. I save the code in file called test.php. I calle the program: http://localhost/php/test.php, but it cannot find the file.

Answer 1

I found out myself

Answer 2

are you sure that server is started?