If I have a static function inside a class that does the comparasion of two objects, I haven't found a way of passing a reference to it in uasort (u.*sort). I tried "Classname::function", also "Classname->function".

If the function doesn't exists, not even an error is produced, so its very difficult to debug such things.

Heres an example of what doesn't work:

class TestObj {
    var $name;
    function TestObj($name) { $this->name = $name; }

    /* This is the static comparing function: */
    function cmp_obj($a, $b) {
        $al = strtolower($a->name);
        $bl = strtolower($b->name);
        if ($al == $bl) return 0;
        return ($al > $bl) ? +1 : -1;
    }

}

$a[] = new TestObj("b");
$a[] = new TestObj("a");
$a[] = new TestObj("d");

uasort($a, "TestObj::cmp_obj");

printf("<pre>\n");
print_r($a);
printf("</pre>\n");

-> Result: NOT SORTED.