如何获取常量的名称？

Question

const

  STUFF      = 1,
  MORE_STUFF = 3,
  ...
  LAST_STUFF = 45;  


function($id = self::STUFF){
  if(defined('self::'.$id)){
    // here how do I get the name of the constant?
    // eg "STUFF"
  }
}

Can I get it without a huge case statement?

Answer 1

Have a look at ReflectionClass::getConstants.

Something like (it's pretty ugly and inefficient, btw):

class Foo {
    const

      STUFF      = 1,
      MORE_STUFF = 3,
      ...
      LAST_STUFF = 45;     

    function get_name($id = self::STUFF)
    {
         $rc = new ReflectionClass ('Foo');
         $consts = $oClass->getConstants ();

         foreach ($consts as $name => $value) {
             if ($value === $id) {
                 return $name;
             }
         }
         return NULL;
    }
}