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class ObjectTracker //對(duì)象跟蹤器
{
private static $nextSerial = 0;
private $id;
private $name;

function __construct($name) //構(gòu)造函數(shù)
{
$this->name = $name;
$this->id = ++self::$nextSerial;
}

function __clone() //克隆
{
$this->name = "Clone of $this->name";
$this->id = ++self::$nextSerial;
}

function getId() //獲取id屬性的值
{
return($this->id);
}

function getName() //獲取name屬性的值
{
return($this->name);
}
}

$ot = new ObjectTracker("Zeev's Object");
$ot2 = clone$ot;

//輸出: 1 Zeev's Object
print($ot->getId() . " " . $ot->getName() . "
");

//輸出: 2 Clone of Zeev's Object
print($ot2->getId() . " " . $ot2->getName() . "
");
?>