关于数据库：PHP和枚举问题

PHP and Enum Troubles

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我到处都找过了，似乎找不到答案。我的问题是，我正在尝试使用"枚举"来表示数据库中的排名，但不断出错。我下面有什么我想能够显示在一个特定的分区取决于什么等级的成员。这就是我到目前为止所拥有的，我哪里出错了？如果有人能解释一下这是否正确，或者我需要做些什么来完成这项工作，我会非常感激。

PHP:

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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.
";
} elseif (Rank::LEGEND == $rank) {
echo"Post something about being Legend.
";
} 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：

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