traits.php

<?php
trait Loggable {
	public function log($event) {
		printf("Event: '%s', source: '%s'\n", 
                    event, get_class($this));
	}
}

class User {
	use Loggable;
	public function something() {
		$this->log("Something happened");
	}
}

$u = new User;
$u->something();

// will echo:
// Event: 'Something happened', source: 'User'