Section fifth-cloning-Classes and Objects in PHP5 [5]

Section Fifth-cloning
The object model in PHP5 invokes an object by reference, but sometimes you might want to create a copy of an object and expect the original object to change without affecting the copy. For this purpose, PHP defines a special method called __clone. Like __construct and __destruct, there are two underscores in front.
By default, the __clone method creates an object that has the same properties and methods as the original object. If you want to change the default content during cloning, you will overwrite (attribute or method) in the __clone.
A cloned method can have no parameters, but it also contains this and that pointer (that points to the object being copied). If you choose to clone yourself, you have to be careful to copy any information that you want your object to contain, from that to this. If you use __clone to copy. PHP does not perform any recessive replication,
An example of automating an object with a series ordinal is shown below:
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<?php
Class Objecttracker//Object Tracker
{
private static $nextSerial = 0;
Private $id;
Private $name;
function __construct ($name)//constructor
{
$this->name = $name;
$this->id = ++self:: $nextSerial;
}
function __clone ()//Clone
{
$this->name = "Clone of $that->name";
$this->id = ++self:: $nextSerial;
}
function getId ()//Get the value of the id attribute
{
Return ($this->id);
}