README

A simple Enum PHP project.

Why?

Despite when I wrote this little project PHP8 already exists with its own native Enum. I decided to because I had some free time and some projects still using lower PHP versions. Then I decided to write this with all features that I missed in other PHP Enum libraries.

My version of Enum ensure that all instances of the same class constant will always be the same instance. So, does not matter how many times we try to retrieve the enum instance, it will always have the same memory address.

How to install

Require via composer

composer require Fabiomez/php-enum

Or add to your composer.json require session

{
...
  "require": {
    ...
    "Fabiomez/php-enum": "1.0.0"
    ...
  },
...
}

How to use

Declaring

First declare a class that extents from fabiome\Enum\Enum

use Fabiomez\Enum\Enum;

/**
 * @method static self OK
 * @method static self BAD_REQUEST
 */
class HttpCode extends Enum
{
    const OK = 200;
    const BAD_REQUEST = 400;
}

• DocBlocks is just for IDE auto complete

Retrieving

There are three ways to retrieve Enum instance

Using from static method

$httpCode = HttpCode::from(HttpCode::OK);

Using tryFrom static method

$httpCode = HttpCode::tryFrom(HttpCode::OK);

• The big difference is, while from will throw an InvalidArgumentException if a constant with the given value does not exist into the declared class, tryFrom will just return null;

Using static magic methods

Any declared constant can be called as a static method to retrieve an Enum instance with the constant value.

$httpCode = HttpCode::OK();

This is the big reason for DocBlocks @method declarations.

Getting the value

$httpCode = HttpCode::OK();
echo $httpCode->get(); //print int 200
echo (string) $httpCode; //print string 200

Comparing

By value

HttpCode::OK()->get() == HttpCode::OK; //true
HttpCode::OK()->get() === HttpCode::OK; //true
HttpCode::OK()->eq(HttpCode::OK); //true

By memory addressing

HttpCode::OK() === HttpCode::OK(); //true
HttpCode::OK()->is(HttpCode::OK()); //true