Php output to xml error

I a开发者_运维技巧m following step by step this tutorial http://code.google.com/apis/maps/articles/phpsqlajax.html . I have tried all the 3 ways to output data to an xml file . But i get error "error on line 9 at column 1: internal error" which is the line that php script begins. Connection to database is ok. tables and fields are ok. I tried and copy pasted the exact code from google's tutorial (same values everywhere) to check if there was a problem with my database engine or something and I got an error again this time error on line 10 at column 8: Extra content at the end of the document that is $xmlStr=str_replace('"','"',$xmlStr);

I am running XAMPP 1.7.4 [PHP: 5.3.5]

Changed the php script not to include the file containing the username and password for the database. I manually included those to the script. Not sure why it wasnt working as provided from google instructions but anyway now i get the job done.