How to post variable using getURL?

Why am I not able to pass variable to PHP using getURL?

I have this actionscript …


var bb_debugcount:String = "4";
getURL("myserverpage.php", "_self", "POST");

And I have this in myserverpage.php…


<?php echo "answer is " . $_POST['bb_debugcount']; ?>

All that comes out is “answer is”. The post variable is not there.