I think the following piece of code behaves sort of weird:

<?
    define ('A', 1);

    function test()
    {
	$a = array(1 => true);
	static $stat_a = array(A => true);

	var_dump($a);
	var_dump($stat_a);
    }
    test();
?>

result is:
array(1) {
  [1]=>
  bool(true)
}
array(1) {
  ["A"]=>
  bool(true)
}

I'm not sure whether static variables are supposed to evaluate expressions but even if they were not, the engine should at least issue a warning.