PHP: Instantiate class by reference?

Question

I'm converting some old PHP 4.x code for PHP 5.3. I've come across the following, and I'm not sure what it does.

$variable =& new ClassName();

What is the difference between that, and:

$variable = new ClassName();

Answer 1

In Ye Olde Days of PHP4, =& was necessary when constructing objects. In PHP 5, it's not.

=& does reference assignment.

E.G.:

$a = 'a';
$b =& $a;
$b = 'b';
echo $a; // Prints 'b', since a and b have been linked by &=.

In other words, it has its uses, just not when instantiating an object. For that use, it's been depreacted.