<!DOCTYPE html>
<html>
<body>
<?php
class MyClass {
public $amount;
public function __clone() {
$value = $this->amount;
unset($this->amount); // Unset breaks references
$this->amount = $value;
}
}
// Create an object with a reference
$value = 5;
$obj = new MyClass();
$obj->amount = &$value;
// Clone the object
$copy = clone $obj;
// Change the value in the original object
$obj->amount = 6;
// The copy is not changed
