So weird why doesnt my spending data to php work?

okay so php is


<?php
$abc = $_POST['abc'];
echo "$abc";
?>

flash is


// frame one <---
var abc = "HELLO";
loadVariablesNum("http://localhost/abc.php",0,"POST");

^ its so weird it doesnt work now, i made a register user name script and it works and now i try this simple test and it doent any ideas? whats the scope of loadVariablesNum