PHP lightweight Enum trait

Simple trait to create enumeration classes.

Separate your enumerations into standalone classes and validate through your application that you are passing valid enumeration values.

Installation

Recommended to install using composer:

composer require richard-ejem/enum

Example

class UserRole
{
    use \Ejem\Enum\EnumTrait;
    
    const GUEST = 'guest';
    const USER = 'user';
    const ADMIN = 'admin';
}

class User
{
    /** @var string UserRole enum */
    private $role;
    
    /** @throws \Ejem\Enum\InvalidEnumValueException */
    public function __construct(string $role)
    {
        $this->setRole($role);
    }
    
    public function getRole(): string
    {
        return $this->role;
    }
    
    /** @throws \Ejem\Enum\InvalidEnumValueException */
    public function setRole(string $role): void
    {
        UserRole::assertValidValue($role);
        $this->role = $role;
    }
    
    // ... more user stuff
}

Other features

// Validate without throwing exception.
// imagine you are importing users from an old system,
// setting all unsupported roles to GUEST:

$role = UserRole::isValidValue($row['role']) ? $row['role'] : UserRole::GUEST;
    
// Retrieve all possible values.
// Assign random color to a shape

$values = Color::getPossibleValues();
$shape->setColor($values[mt_rand(0, count($values)-1)]);