Enum-like class for PHP

AbstractEnum.php

<?php

/**
 * Base class used to build enums
 */
abstract class AbstractEnum
{
    /**
     * @var array Options array, suitable for a select box
     */
    protected static $optionsArray = array();

    /**
     * Get human-friendly label for the given enum value
     * @param int $val
     *
     * @return string
     */
    public static function getLabel($val)
    {
        return static::$optionsArray[$val];
    }

    /**
     * Get array of options suitable for a select box
     * @return array
     */
    public static function getOptionsArray()
    {
        return static::$optionsArray;
    }

    /**
     * Get all the values
     * This is equivalent to the keys of the options array
     *
     * @return array
     */
    public static function getValues()
    {
        return array_keys(static::$optionsArray);
    }
}

AuthMethod.php

<?php

class AuthMethod extends AbstractEnum
{
    const AUTH_METHOD_NONE = 'none';
    const AUTH_METHOD_BASIC = 'basic';
    
    /**
     * @var array Options array, suitable for a select box
     */
    protected static $optionsArray = array(
        self::AUTH_METHOD_NONE => 'None',
        self::AUTH_METHOD_BASIC => 'Basic Authorization',
    );
}