PHP用Array模拟枚举

C#中枚举Enum的写法：

/// <summary>
/// 公开类型 2-好友可见 1-公开 0-不公开
/// </summary>
public enum OpenStatusWithFriend
{
    /// <summary>
    /// 不公开
    /// </summary>
    Close = 0,
    /// <summary>
    /// 公开
    /// </summary>
    Open = 1,
    /// <summary>
    /// 好友可见
    /// </summary>
    Friend = 2        
}

PHP中没有枚举类型，用Array来模拟表示：

public class testInfo
{
    //公开类型
    public static $OpenStatusWithFriend = array (
            //不公开
            'Close' => 0,
            //公开
            'Open' => 1,
            //好友可见
            'Friend'=>2
    );
}

PHP访问：

$openType = testInfo::$OpenStatusWithFriend['Close'];