> would anyone know what the problem is?

The example is written to use PHP4 DOM XML extension.
The article says
http://code.google.com/apis/maps/articles/phpsqlajax.html#outputxml
"Check your configuration or try initializing a domxml_new_doc() to
determine if your server's PHP has dom_xml functionality on."
The article offers alternative advice further down in the case
"If you don't have access to PHP's dom_xml functions, ...."
and provides an alternative method which will work in PHP5

PHP reference for DOM XML says
http://www.php.net/manual/en/intro.domxml.php
"This extension ... never be released with PHP 5, and will only be
distributed with PHP 4. If you need DOM XML support with PHP 5 you can
use the DOM extension. This domxml extension is not compatible with
the DOM extension."

It's not a fault in the example, which does provide a method that will
work  in PHP5.  As the v2 API is now deprecated I doubt Google will be
looking to revise the example with PHP5 methods.

There's nothing to stop you adapting the example to work with DOM
rather than DOM XML,  which is what you are already doing of course,
but it is up to you to do it  There is help out there for that task
http://www.google.com/search?q=php5+domxml+conversion

There are old threads about it all
http://groups.google.com/group/google-maps-api/search?group=google-maps-api&q=domxml_new_doc

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