szurubooru/src/Enum.php

<?php
class Enum
{
	public static function toString($constant)
	{
		$cls = new ReflectionClass(get_called_class());
		$constants = $cls->getConstants();
		return array_search($constant, $constants);
	}

	public static function toDisplayString($constant)
	{
		return TextCaseConverter::convert(static::toString($constant),
			TextCaseConverter::SNAKE_CASE,
			TextCaseConverter::BLANK_CASE);
	}

	public static function getAll()
	{
		$cls = new ReflectionClass(get_called_class());
		$constants = $cls->getConstants();
		return array_values($constants);
	}
}