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

Can't reproduce the "error" and neither can codepad: http://codepad.org/5kwctnDP

You could also use object properties instead of global variables

test;
        return strcmp($a, $b);
    }
}


$topics = array(1,2,3);
$foo = new Foo;
usort($topics, array($foo, 'bar'));