Description:
------------
PHP is using toString on most places to cast objects to string. However define is not doing this. This seems somewhat of an oddity as objects are casted in other functions aswell.

Possible fix to this problem was provided by bjori:

http://php.is/bugs/toString/define.call.toString.patch.txt

Reproduce code:
---------------
<?php

class foo 
{

	function __toString()
	{
		
		return "bar";
		
	}
	
}

$foo = new foo();

define('COWBELL', $foo);

?>

Expected result:
----------------
It being properly defined using the toString function.

Actual result:
--------------
Warning: Constants may only evaluate to scalar values in test.php on line 15