PHP枚举集

Question

是否可以像在Delphi中那样在PHP中创建枚举类型集？

我想为[必需，只读，...]之类的组件创建一组选项。我见过PHP and Enumerations，但不能完全解决我的问题。

例如，在Delhpi中，您可以执行以下操作：

type enum_options = (required, readonly, ...); // Enumerated type
options_for_my_component := [required, readonly];
...
if (required in options_for_my_component) then
   ...

更多信息，http://www.delphibasics.co.uk/Article.asp?Name=Sets

Answer 1

还是有点不确定您在PHP中缺少什么。使用in_array应该非常简单（除非我错过了什么）：

abstract class DaysOfWeek
{
  const Sunday = 0;
  const Monday = 1;
  const Tuesday = 2;
  const Wednesday = 3;
  const Thursday = 4;
  const Friday = 5;
  const Saturday = 6;
}

$working_days = [DaysOfWeek::Monday, DaysOfWeek::Tuesday, DaysOfWeek::Wednesday, DaysOfWeek::Thursday, DaysOfWeek::Friday];
$today = (int)date('w');

echo in_array($today, $working_days) ? 'Today is a working day!' : 'Today is a weekend day!';

演示：https://3v4l.org/RJg9B

（您明天可以尝试此演示，它应该说是一个工作日：））