<?
	function test()
	{
		if(defined("SOME_CONSTANT")) print("YES: ");
		
		print(SOME_CONSTANT);
	}

	define("SOME_CONSTANT", "the value of the constant");

	
	test();
?>

This produces "YES: SOME_CONSTANT".  I know I may be using constants in an unintended way, but I'd like to set a constant value sometime after I've defined a function that uses it.  If this use is disallowed, I'm cool with that decision, but in that case, I'd like to see a parse error about an unrecognized token.