php - PHP と列挙の問題

Question

私はいたるところを見てきましたが、これを理解できないようです。私の問題は、データベースにあるランクに「列挙型」を使用しようとしていますが、エラーが発生し続けることです。私が以下に持っているものは、メンバーのランクに応じて特定の div に表示できるようにしたいと考えています。これは私がこれまでに持っているものです。どこが間違っていますか? これが正しいかどうか、またはこれを機能させるために私が何をする必要があるかについて誰かが光を当てることができれば、私はそれを大いに感謝します.

PHP:

class Rank
{
  // If no value is given during object construction this value is used
  const __default = 1;
  // Our enum values
  const Registered       = 1;
  const Legend           = 2;
  const Inactive         = 3;
  const Greenhorn        = 4;
  const FullMember       = 5;
  const JuniorAdmin      = 6;
  const SeniorAdmin      = 7;
  const Leader           = 8;
  const Founder          = 9;
  const OriginalFounder  = 10;
}

$registered     = new Rank(Rank::REGISTERED);
$legend         = new Rank(Rank::LEGEND);
$inactive           = new Rank(Rank::INACTIVE);
$greenhorn          = new Rank(Rank::GREENHORN);
$fullmember     = new Rank(Rank::FULLMEMBER);
$junioradmin        = new Rank(Rank::JUNIORADMIN);
$senioradmin        = new Rank(Rank::SENIORADMIN);
$leader         = new Rank(Rank::LEADER);
$founder            = new Rank(Rank::FOUNDER);
$originalfounder    = new Rank(Rank::ORIGINALFOUNDER);
$fail              = 1;

function responsibilities(Rank $rank)
{
  if (Rank::REGISTERED == $rank) {
    echo "Post something about being a registered member.\n";
  } elseif (Rank::LEGEND == $rank) {
    echo "Post something about being Legend.\n";
  } elseif (Rank::INACTIVE == $rank) {
    echo "Post something about being Inactive./n";
  } elseif (Rank::GREENHORN == $rank) {
    echo "Post something about being a Greenhorn./n";
  } elseif (Rank::FULLMEMBER == $rank) {
    echo "Post something about being a Full Member./n";
  } elseif (Rank::JUNIORADMIN == $rank) {
    echo "Post something about being a Junior Admin./n";
  } elseif (Rank::SENIORADMIN == $rank) {
    echo "Post something about being a Senior Admin./n";
  } elseif (Rank::LEADER == $rank) {
    echo "Post something about being a Leader./n";
  } elseif (Rank::FOUNDER == $rank) {
    echo "Post something about being a Founder./n";
  } elseif (Rank::ORIGINALFOUNDER == $rank) {
    echo "Post something about being an Original Founder./n";
  }
}

responsibilities($registered);
responsibilities($legend);
responsibilities($inactive);
responsibilities($greenhorn);
responsibilities($fullmember);
responsibilities($junioradmin);
responsibilities($senioradmin);
responsibilities($leader);
responsibilities($founder);
responsibilities($originalfounder);

responsibilities($fail);

HTML:

<p><?php echo $rank ?></p>