pfft, try this:
And then click on your link to make sure
1) _GET has what you expect
2) your script has the right subid appended
3) your network accepts your subid.
Code:
<?php
print nl2br( print_r( $_GET, true ));
$subid=trim( $_GET['number'] );
$dest= "hxxp://publishers.xy7.com/z/43422/CD3149/".$subid;
die( "my destination is <a href=\"$dest\">$dest</a>.<br />\n" );
?>
And then click on your link to make sure
1) _GET has what you expect
2) your script has the right subid appended
3) your network accepts your subid.