PHP Enum Implementation

The package implement ideas from RFC Enumerations and provide abstract class Enum that intended to create enumerated objects with support extra data and auxiliary static functions values(), cases() and isValid().

Requirements

• PHP 8.0 or higher.

Installation

The package could be installed with composer:

composer require vjik/php-enum --prefer-dist

General usage

Declaration of class

use Vjik\Enum\Enum;

/**
 * @method static self NEW()
 * @method static self PROCESS()
 * @method static self DONE()
 */
final class Status extends Enum
{
    private const NEW = 'new';
    private const PROCESS = 'process';
    private const DONE = 'done';
}

Creating an object

By static method from()

$process = Status::from('process');

On create object with invalid value throws ValueError.

By static method tryFrom()

$process = Status::tryFrom('process'); // Status object with value "process"
$process = Status::tryFrom('not-exists'); // null

On create object with invalid value returns null.

By static method with a name identical to the constant name

Static methods are automatically implemented to provide quick access to an enum value.

$process = Status::PROCESS();

Getting value and name

Status::DONE()->getName(); // DONE
Status::DONE()->getValue(); // done

Class with extra data

Set data in the protected static function data() and create getters using the protected method getPropertyValue(). Also you can create getter using protected method match().

use Vjik\Enum\Enum;

/**
 * @method static self CREATE()
 * @method static self UPDATE()
 */
final class Action extends Enum
{
    private const CREATE = 1;
    private const UPDATE = 2;

    protected static function data(): array
    {
        return [
            self::CREATE => [
                'tip' => 'Create document',
            ],
            self::UPDATE => [
                'tip' => 'Update document',
            ],
        ];
    }

    public function getTip(): string
    {
        /** @var string */
        return $this->getPropertyValue('tip');
    }
    
    public function getColor(): string
    {
        return $this->match([
            self::CREATE => 'red',
            self::UPDATE => 'blue',
        ]);
    }
    
    public function getCode(): int
    {
        return $this->match([
            self::CREATE => 1,
        ], 99);
    }
}

Usage:

echo Action::CREATE()->getTip();
echo Action::CREATE()->getColor();
echo Action::CREATE()->getCode();

Auxiliary static functions

List of values values()

Returns list of values.

// [1, 2]
Action::values(); 

List of objects cases()

Returns list of objects:

// [$createObject, $updateObject]
Action::cases();

Validate value isValid()

Check if value is valid on the enum set.

Action::isValid(1); // true
Action::isValid(99); // false

Casting to string

Enum support casting to string (using magic method __toString). The value is returned as a string.

echo Status::DONE(); // done

Testing

Unit testing

The package is tested with PHPUnit. To run tests:

./vendor/bin/phpunit

Mutation testing

The package tests are checked with Infection mutation framework. To run it:

./vendor/bin/infection

Static analysis

The code is statically analyzed with Psalm. To run static analysis:

./vendor/bin/psalm

License

The PHP Enum implementation is free software. It is released under the terms of the BSD License. Please see LICENSE for more information.

Credits

Version 3 of this package is inspired by myclabs/php-enum.