This may be your problem :
Quote:
If status is an integer, that value will also be used as the exit status. Exit statuses should be in the range 0 to 254, the exit status 255 is reserved by PHP and shall not be used. The status 0 is used to terminate the program successfully.
Note: PHP >= 4.2.0 does NOT print the status if it is an integer.
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http://www.php.net/manual/en/function.exit.php
die() is same as exit() for the most part.
Try using
var_dump($id); die(); instead.