can't access global variables inside a usort function?

Question

I\'m trying to do a usort in PHP, but I can\'t access global variables inside a usort function.

I\'ve simplified my code down to bare bones to show what I mean:

Answer 1

It is working as of php 5.2.4

$testglobal = ' WORKING ';
$topics = array('a','b','c');      
function cmp($a, $b) {
    global $testglobal;
    echo 'hi' . $testglobal;
}
usort($topics, "cmp");
// hi WORKING hi WORKING