vendor/myclabs/php-enum/src/Enum.php

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<?php
/**
 * @link    http://github.com/myclabs/php-enum
 * @license http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file)
 */

namespace MyCLabs\Enum;

/**
 * Base Enum class
 *
 * Create an enum by implementing this class and adding class constants.
 *
 * @author Matthieu Napoli <matthieu@mnapoli.fr>
 * @author Daniel Costa <danielcosta@gmail.com>
 * @author Mirosław Filip <mirfilip@gmail.com>
 */
abstract class Enum implements \JsonSerializable
{
    /**
     * Enum value
     *
     * @var mixed
     */
    protected $value;

    /**
     * Store existing constants in a static cache per object.
     *
     * @var array
     */
    protected static $cache = [];

    /**
     * Creates a new value of some type
     *
     * @param mixed $value
     *
     * @throws \UnexpectedValueException if incompatible type is given.
     */
    public function __construct($value)
    {
        if ($value instanceof static) {
            $this->value = $value->getValue();

            return;
        }

        if (!$this->isValid($value)) {
            throw new \UnexpectedValueException("Value '$value' is not part of the enum " . \get_called_class());
        }

        $this->value = $value;
    }

    /**
     * @return mixed
     */
    public function getValue()
    {