Install does not start

Thursday 07 December 2006 7:40:28 am

To make things more clear:
index.ph wont even start executing.
I tried another php-script an all went ok.
Is there something wrong with PHP 4.4.4 or is the source code of ezpublish damaged?

I tried several versions of ezpublish and nothing worked.
If I uncomment the

if ( file_exists( 'ezp.xt' ) )
{
$fd = fopen( 'ezp.xt', 'w' ); fclose( $fd );
}
xdebug_start_trace( 'ezp' );

I got an error message. This shows me, that he does execute index.php.

Friday 08 December 2006 2:31:23 am

Thats the error I get when uncommenting the lines 25 to 29 in index.php:

Fatal error: Call to undefined function: xdebug_start_trace() in D:\websites\xampp\xampp-win32-1.5.5\htdocs\ezpublish\index.php on line 29