Traits

Traits is a concept in PHP that allows code reusability by enabling developers to create reusable pieces of code which can be used in classes to extend functionality. They are a way to reduce intricacies of single inheritance by enabling a developer to reuse sets of methods freely in several independent classes.

Here's an example how to use a Trait:

trait Greeting {
    public function sayHello() {
        return "Hello";
    }
}
class User {
    use Greeting;
}
$user = new User();
echo $user->sayHello(); // Outputs: Hello

In the above code snippet, the Greeting trait is being used in the User class, and we are able to use its methods as if they were defined in the User class.