Are multiple variable assignments done by value or reference?

Question

$a = $b = 0;

In the above code, are both $a and $b assigned the value of 0, or is $a just refer

Answer 1

You could have tried it yourself

$a = $b = 0;
$a = 5;
echo $b;

or

$a = $b = 0;
$b = 5;
echo $a;

(currently I dont really care :D)

Thus: No, they are both independent variables with the value 0.