PHP Enums
Requires
- php: ^7.1
- ext-json: *
Requires (Dev)
- larapack/dd: ^1.0
- phpunit/phpunit: ^7.0
README
THIS PACKAGE IS A FORK OF Spatie/Enum to allow for PHP 7.1 support.
This package offers strongly typed enums in PHP. We don't use a simple "value" representation, so you're always working with the enum object. This allows for proper autocompletion and refactoring in IDEs.
Here's how enums are created with this package:
/** * @method static self draft() * @method static self published() * @method static self archived() */ class StatusEnum extends Enum { }
And this is how they are used:
public function setStatus(StatusEnum $status): void { $this->status = $status; } // … $class->setStatus(StatusEnum::draft());
Installation
You can install the package via composer:
composer require fatturaelettronicaphp/enum
Usage
This is how an enum can be defined.
/** * @method static self draft() * @method static self published() * @method static self archived() */ class StatusEnum extends Enum { }
This is how they are used:
public function setStatus(StatusEnum $status) { $this->status = $status; } // … $class->setStatus(StatusEnum::draft());
Creating an enum from a value
$status = StatusEnum::from('draft'); // or $status = new StatusEnum('published');
Override enum values
By default, the string value of an enum is simply the name of that method.
In the previous example it would be draft
.
You can override this value, by adding the $map
property:
/** * @method static self draft() * @method static self published() * @method static self archived() */ class StatusEnum extends Enum { protected static $map = [ 'draft' => '1', 'published' => 'other published value', 'archived' => '-10', ]; }
Mapping values is optional.
Note that mapped values should always be strings.
Comparing enums
Enums can be compared using the equals
method:
$status->equals($otherStatus);
You can also use dynamic is
methods:
$status->isDraft(); // return a boolean
Note that if you want auto completion on these is
methods, you must add extra doc blocks on you enum classes.
Enum specific methods
There might be a case where you want to have functionality depending on the concrete enum value.
There are several ways to do this:
- Add a function in the enum class and using a switch statement or array mapping.
- Use a separate class which contains this switch logic, something like enum extensions in C#.
- Use enum specific methods, similar to Java.
This package also supports these enum specific methods. Here's how you can implement them:
abstract class MonthEnum extends Enum { abstract public function getNumericIndex(): int; public static function january(): MonthEnum { return new class() extends MonthEnum { public function getNumericIndex(): int { return 1; } }; } public static function february(): MonthEnum { return new class() extends MonthEnum { public function getNumericIndex(): int { return 2; } }; } // … }
By declaring the enum class itself as abstract, and using static constructors instead of doc comments, you're able to return an anonymous class per enum, each of them implementing the required methods.
You can use this enum the same way as any other:
MonthEnum::january()->getNumericIndex()
Note that one drawback of this approach is that the value of the enum is always the name of the static function, there's no way of mapping it.
Testing
composer test
Changelog
Please see CHANGELOG for more information on what has changed recently.
Contributing
Please see CONTRIBUTING for details.
Security
If you discover any security related issues, please email daniele@weble.it instead of using the issue tracker.
Credits
License
The MIT License (MIT). Please see License File for more information.