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TypesafeEnum

Latest Stable Version License Circle CI

A lightweight, type safe enum library for PHP.

Use it to provide safe enums with autocompletion support. Fits well in domain driven designed applications.

Get started

Install via composer

composer install mpscholten/typesafe-enum

Basic Usage

class UserType extends \TypesafeEnum\Enum
{
    public static function PAID()
    {
        return new UserType('paid');
    }

    public static function FREE()
    {
        return new UserType('free');
    }

    public function isPaid()
    {
        return $this->is('paid');
    }

    public function isFree()
    {
        return $this->is('free');
    }
}

class User
{
    public function __construct($email, UserType $type)
    {
        $this->type = $type;
    }

    public function getType()
    {
        return $this->type;
    }
}

$user = new User('hello@example.com', UserType::PAID()); // Good
$user->getType()->isPaid(); // true
$user->getType()->isFree(); // false
(string) $user->getType(); // "paid"

$user = new User('hello@example.com', UserType::FREE()); // Good
$user->getType()->isFree(); // true
$user->getType()->isPaid(); // false
(string) $user->getType(); // "free"

$user = new User('hello@example.com', 'some string'); // Type error (PHP Catchable fatal error:  Argument 2 passed to User::__construct() must be an instance of UserType, integer given, called in ...)
$user = new User('hello@example.com', null); // Type error (PHP Catchable fatal error:  Argument 2 passed to User::__construct() must be an instance of UserType, null given, called in ...)

Extended Usage

class Temperature extends Enum
{
    private $celsius;

    protected function __construct($value, $celsius)
    {
        parent::__construct($value);
        $this->celsius = $celsius;
    }

    public static function HOT()
    {
        return new Temperature('hot', 40);
    }

    public static function COLD()
    {
        return new Temperature('cold', 10);
    }

    public function isHot()
    {
        return $this->is('hot');
    }

    public function isCold()
    {
        return $this->is('cold');
    }

    /**
     * @return int
     */
    public function getCelsius()
    {
        return $this->celsius;
    }
}

$temperature = Temperature::HOT();
$temperature->isHot(); // true
$temperature->isCold(); // false
$temperature->getCelsius(); // 40
(string) $temperature; // "hot"

$temperature = Temperature::COLD();
$temperature->isCold(); // true
$temperature->isHot(); // false
$temperature->getCelsius(); // 10
(string) $temperature; // "cold"

As you can see above the suggested way to assign an attribute (in this case celsius) to each value in the value set of the enum is to add a new property to the class and to override the constructor. Don't use a switch statement for this.

This will make sure that there's always one assigned attribute per value in the value set of the enum, so the assigned attributes will not get out of sync with the value set.

Usage with doctrine2

You can use this library together with doctrine2 by using so called embeddables:

/** @Embeddable */
class UserType extends \TypesafeEnum\Enum
{
    /** @Column(type = "smallint", name = "type") */
    protected $value; // Override the `$value` property of \TypesafeEnum\Enum and apply mapping

    public static function PAID()
    {
        return new UserType(0);
    }

    public static function FREE()
    {
        return new UserType(1);
    }

    public function isPaid()
    {
        return $this->is(0);
    }

    public function isFree()
    {
        return $this->is(1);
    }
}

class User
{
    /** @Embedded(class = "UserType", columnPrefix = false) */
    private $type;

    public function __construct($email, UserType $type)
    {
        $this->type = $type;
    }
}

Tests

You can run the phpunit suite with make

make tests

Contributing

Feel free to send pull requests!

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A lightweight, type safe enum library for PHP

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