Tell about your experience using enum data type in projects.

In PHP projects, I used enum to define a limited set of values, which improved code readability and reliability. For example, for order statuses, you can define an enum with options: Pending, Processing, Completed.

Example of enum in PHP 8.1+:

enum OrderStatus: string {
    case Pending = 'pending';
    case Processing = 'processing';
    case Completed = 'completed';
}

function updateOrderStatus(OrderStatus $status) {
    // logic to update status
}

updateOrderStatus(OrderStatus::Processing);

Using enum helps avoid errors related to passing incorrect strings or numbers and makes code maintenance easier.