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✏️ Editing: Enum.php

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

$this->value = $value;
    }

/**
     * @return mixed
     */
    public function getValue()
    {
        return $this->value;
    }

/**
     * Returns the enum key (i.e. the constant name).
     *
     * @return mixed
     */
    public function getKey()
    {
        return static::search($this->value);
    }

/**
     * @return string
     */
    public function __toString()
    {
        return (string)$this->value;
    }

/**
     * Compares one Enum with another.
     *
     * This method is final, for more information read https://github.com/myclabs/php-enum/issues/4
     *
     * @return bool True if Enums are equal, false if not equal
     */
    final public function equals(Enum $enum = null)
    {
        return $enum !== null && $this->getValue() === $enum->getValue() && \get_called_class() === \get_class($enum);
    }

/**
     * Returns the names (keys) of all constants in the Enum class
     *
     * @return array
     */
    public static function keys()
    {
        return \array_keys(static::toArray());
    }

/**
     * Returns instances of the Enum class of all Enum constants
     *
     * @return static[] Constant name in key, Enum instance in value
     */
    public static function values()
    {
        $values = array();

foreach (static::toArray() as $key => $value) {
            $values[$key] = new static($value);
        }

return $values;
    }

/**
     * Returns all possible values as an array
     *
     * @return array Constant name in key, constant value in value
     */
    public static function toArray()
    {
        $class = \get_called_class();
        if (!isset(static::$cache[$class])) {
            $reflection            = new \ReflectionClass($class);
            static::$cache[$class] = $reflection->getConstants();
        }

return static::$cache[$class];
    }

/**
     * Check if is valid enum value
     *
     * @param $value
     *
     * @return bool
     */
    public static function isValid($value)
    {
        return \in_array($value, static::toArray(), true);
    }

/**
     * Check if is valid enum key
     *
     * @param $key
     *
     * @return bool
     */
    public static function isValidKey($key)
    {
        $array = static::toArray();

return isset($array[$key]) || \array_key_exists($key, $array);
    }

/**
     * Return key for value
     *
     * @param $value
     *
     * @return mixed
     */
    public static function search($value)
    {
        return \array_search($value, static::toArray(), true);
    }

/**
     * Returns a value when called statically like so: MyEnum::SOME_VALUE() given SOME_VALUE is a class constant
     *
     * @param string $name
     * @param array  $arguments
     *
     * @return static
     * @throws \BadMethodCallException
     */
    public static function __callStatic($name, $arguments)
    {
        $array = static::toArray();
        if (isset($array[$name]) || \array_key_exists($name, $array)) {
            return new static($array[$name]);
        }

throw new \BadMethodCallException("No static method or enum constant '$name' in class " . \get_called_class());
    }

/**
     * Specify data which should be serialized to JSON. This method returns data that can be serialized by json_encode()
     * natively.
     *
     * @return mixed
     * @link http://php.net/manual/en/jsonserializable.jsonserialize.php
     */
    public function jsonSerialize()
    {
        return $this->getValue();
    }
}

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