You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
3.9 KiB
Markdown
133 lines
3.9 KiB
Markdown
# PHP Enum implementation inspired from SplEnum
|
|
|
|
[](https://travis-ci.org/myclabs/php-enum)
|
|
[](https://packagist.org/packages/myclabs/php-enum)
|
|
[](https://packagist.org/packages/myclabs/php-enum)
|
|
[](https://shepherd.dev/github/myclabs/php-enum)
|
|
|
|
Maintenance for this project is [supported via Tidelift](https://tidelift.com/subscription/pkg/packagist-myclabs-php-enum?utm_source=packagist-myclabs-php-enum&utm_medium=referral&utm_campaign=readme).
|
|
|
|
## Why?
|
|
|
|
First, and mainly, `SplEnum` is not integrated to PHP, you have to install the extension separately.
|
|
|
|
Using an enum instead of class constants provides the following advantages:
|
|
|
|
- You can type-hint: `function setAction(Action $action) {`
|
|
- You can enrich the enum with methods (e.g. `format`, `parse`, …)
|
|
- You can extend the enum to add new values (make your enum `final` to prevent it)
|
|
- You can get a list of all the possible values (see below)
|
|
|
|
This Enum class is not intended to replace class constants, but only to be used when it makes sense.
|
|
|
|
## Installation
|
|
|
|
```
|
|
composer require myclabs/php-enum
|
|
```
|
|
|
|
## Declaration
|
|
|
|
```php
|
|
use MyCLabs\Enum\Enum;
|
|
|
|
/**
|
|
* Action enum
|
|
*/
|
|
class Action extends Enum
|
|
{
|
|
private const VIEW = 'view';
|
|
private const EDIT = 'edit';
|
|
}
|
|
```
|
|
|
|
## Usage
|
|
|
|
```php
|
|
$action = Action::VIEW();
|
|
|
|
// or with a dynamic key:
|
|
$action = Action::$key();
|
|
// or with a dynamic value:
|
|
$action = new Action($value);
|
|
```
|
|
|
|
As you can see, static methods are automatically implemented to provide quick access to an enum value.
|
|
|
|
One advantage over using class constants is to be able to type-hint enum values:
|
|
|
|
```php
|
|
function setAction(Action $action) {
|
|
// ...
|
|
}
|
|
```
|
|
|
|
## Documentation
|
|
|
|
- `__construct()` The constructor checks that the value exist in the enum
|
|
- `__toString()` You can `echo $myValue`, it will display the enum value (value of the constant)
|
|
- `getValue()` Returns the current value of the enum
|
|
- `getKey()` Returns the key of the current value on Enum
|
|
- `equals()` Tests whether enum instances are equal (returns `true` if enum values are equal, `false` otherwise)
|
|
|
|
Static methods:
|
|
|
|
- `toArray()` method Returns all possible values as an array (constant name in key, constant value in value)
|
|
- `keys()` Returns the names (keys) of all constants in the Enum class
|
|
- `values()` Returns instances of the Enum class of all Enum constants (constant name in key, Enum instance in value)
|
|
- `isValid()` Check if tested value is valid on enum set
|
|
- `isValidKey()` Check if tested key is valid on enum set
|
|
- `search()` Return key for searched value
|
|
|
|
### Static methods
|
|
|
|
```php
|
|
class Action extends Enum
|
|
{
|
|
private const VIEW = 'view';
|
|
private const EDIT = 'edit';
|
|
}
|
|
|
|
// Static method:
|
|
$action = Action::VIEW();
|
|
$action = Action::EDIT();
|
|
```
|
|
|
|
Static method helpers are implemented using [`__callStatic()`](http://www.php.net/manual/en/language.oop5.overloading.php#object.callstatic).
|
|
|
|
If you care about IDE autocompletion, you can either implement the static methods yourself:
|
|
|
|
```php
|
|
class Action extends Enum
|
|
{
|
|
private const VIEW = 'view';
|
|
|
|
/**
|
|
* @return Action
|
|
*/
|
|
public static function VIEW() {
|
|
return new Action(self::VIEW);
|
|
}
|
|
}
|
|
```
|
|
|
|
or you can use phpdoc (this is supported in PhpStorm for example):
|
|
|
|
```php
|
|
/**
|
|
* @method static Action VIEW()
|
|
* @method static Action EDIT()
|
|
*/
|
|
class Action extends Enum
|
|
{
|
|
private const VIEW = 'view';
|
|
private const EDIT = 'edit';
|
|
}
|
|
```
|
|
|
|
## Related projects
|
|
|
|
- [Doctrine enum mapping](https://github.com/acelaya/doctrine-enum-type)
|
|
- [Symfony ParamConverter integration](https://github.com/Ex3v/MyCLabsEnumParamConverter)
|
|
- [PHPStan integration](https://github.com/timeweb/phpstan-enum)
|