Q:

create an array of all constant of a class? 

I was working with a class where almost 20 constant are defined, as i want all these constant value in an array, i just want to know
is there any method which create an array of all constant of a class? 
I tried with compact BUT it does not work with constants.  
class Alpha
{
 const ONE = 'fixone'; 
 const TWO = 'fix_two';
 const THREE = 3     

   public function __construct()
   {
     protected $arr_constant = compact(ONE,TWO,THREE); // gives FATAL Error
     // is there any method which collect all consant and create an array? 
     protected $arr_contact = get_all_constant(__CLASS__); 
     var_dump($arr_constant);
   }
}

A:

$ref = new ReflectionClass('Alpha');
var_dump($ref->getConstants());

