what is wrong with the following code php function duplicate obj..., Object Oriented Programming, Zend Certification

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Question:What is wrong with the following code?<?php

function duplicate($obj) {
	$newObj = $obj;
	return $newObj;
}

$a = new MyClass();

$a_copy = duplicate($a);

$a->setValue(10);
$a_copy->setValue(20);

?>

A You must use return &$newObj instead 
B There is nothing wrong with this code 
C duplicate() must accept its parameter by reference 
D You must use the clone operator to make a copy of an object 
E duplicate() must return a reference

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Question:What is wrong with the following code?<?php function duplicate($obj) { $newObj = $obj; return $newObj; } $a = new MyClass(); $a_copy = duplicate($a); $a->setValue(10); $a_copy->setValue(20); ?>

A You must use return &$newObj instead

B There is nothing wrong with this code

C duplicate() must accept its parameter by reference

D You must use the clone operator to make a copy of an object

E duplicate() must return a reference

D

Question:What is wrong with the following code?
<?php function duplicate($obj) { $newObj = $obj; return $newObj; } $a = new MyClass(); $a_copy = duplicate($a); $a->setValue(10); $a_copy->setValue(20); ?>