How to use php 8 enum

How to use php 8 enum

Enums (short for "enumerations") are a new data type in PHP 8 that allows you to define a set of named constants. They are useful for representing a fixed set of values that a variable can take on.

Here is an example of how to use enums in PHP 8:

class Color extends Enum
{
    private const RED = '#ff0000';
    private const GREEN = '#00ff00';
    private const BLUE = '#0000ff';

    public static function RED(): self
    {
        return new self(self::RED);
    }

    public static function GREEN(): self
    {
        return new self(self::GREEN);
    }

    public static function BLUE(): self
    {
        return new self(self::BLUE);
    }
}

$color = Color::RED();
echo $color;  // Outputs: "#ff0000"

In the example above, the Color class extends the Enum class and defines three named constants: RED, GREEN, and BLUE. It also defines three static methods (RED(), GREEN(), and BLUE()) that return new Color objects with the corresponding constant values.

You can use the is() method to check if a Color object is a specific value:

if ($color->is(Color::RED())) {
    echo "The color is red.";
}

You can also use the toArray() method to get an array of all the constants defined in an enum:

$colors = Color::toArray();
print_r($colors);  // Outputs: ["#ff0000", "#00ff00", "#0000ff"]

Enums can also have string or integer values, not just constants. For example:

class Size extends Enum
{
    private const SMALL = 'small';
    private const MEDIUM = 'medium';
    private const LARGE = 'large';

    public static function SMALL(): self
    {
        return new self(self::SMALL);
    }

    public static function MEDIUM(): self
    {
        return new self(self::MEDIUM);
    }

    public static function LARGE(): self
    {
        return new self(self::LARGE);
    }
}

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