OOP enum realisation

Enum.php

<?php

use InvalidArgumentException;
use ReflectionClass;

/**
 * Base Enum class
 * Require PHP >= 5.3
 *
 * @author Ton Sharp <66ton99@gmail.com>
 */
abstract class Enum
{
    /**
     * @return array
     */
    public static function all()
    {
        $reflection = static::getRC();
        $buffer = $reflection->getConstants();
        foreach (array($reflection->getParentClass()) + $reflection->getInterfaces() as $fill) {
            $buffer = array_diff_key($buffer, $fill->getConstants());
        }
        return $buffer;
    }

    /**
     * Values
     *
     * @return array
     */
    public static function values()
    {
        return array_values(static::all());
    }

    /**
     * Keys
     *
     * @return array
     */
    public static function keys()
    {
        return array_keys(static::all());
    }

    /**
     * Check value
     *
     * @param string|int $value
     *
     * @return bool
     */
    public static function isValid($value)
    {
        return in_array($value, static::all(), false);
    }

    /**
     * Check value with exception on fail
     *
     * @param mixed $value
     *
     * @throws InvalidArgumentException if the value does not valid for the enum type
     *
     * @return void
     */
    public static function throwsInvalid($value)
    {
        if (!static::isValid($value)) {
            throw new InvalidArgumentException(
                sprintf(
                    'The enum type `%s` does not contains value `%s` . Possible values are `%s`',
                    get_called_class(),
                    var_export($value, true),
                    static::implode(', ', '`')
                )
            );
        }
    }

    /**
     * Implode all values to the string separated by $separator
     *
     * @param string $separator
     * @param string $quoteSymbol
     *
     * @return string
     */
    public static function implode($separator = ',', $quoteSymbol = '\'')
    {
        return $quoteSymbol . implode($quoteSymbol . $separator . $quoteSymbol, static::values()) . $quoteSymbol;
    }

    /**
     * Get reflection class
     *
     * @return ReflectionClass
     */
    protected static function getRC()
    {
        return new ReflectionClass(get_called_class());
    }

    /**
     * Get default values by default it is first element
     *
     * @return string
     */
    public static function defaultValue()
    {
        $values = (static::values());
        return array_shift($values);
    }
}

Example

class Enums extends Enum
{
    FIRST = 1;
    SECOND = 2;
    THIRD = 3;
}

Usage

var_dump(Enums::all());
var_dump(Enums::implode());

Maybe better to use it https://github.com/marc-mabe/php-enum because it allows you to use type hinting and more...