Ejemplo n.º 1
0
<?php

/**
 * Created by PhpStorm.
 * User: xpcomrade
 * Date: 2015/7/29
 * Time: 19:53
 */
trait Sortable
{
    abstract function uniqueId();
    function compareById($object)
    {
        return $object->uniqueId() < $this->uniqueId() ? -1 : 1;
    }
}
class Bird
{
    use Sortable;
    function uniqueId()
    {
        // TODO: Implement uniqueId() method.
        return __CLASS__ . ":{$this->id}";
    }
}
$bird = new Bird();
echo 'compare result:' . $bird->compareById($bird);