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<!DOCTYPE html>
<html>
<body>
<?php
class MyClass {
  public $amount;
}
// 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
$obj->amount = 6;
// The copy is changed
print_r($copy);
?>
</body>
</html>
MyClass Object
(
    [amount] => 6
)