How check memory location of variable in php?

Question

How check memory location of variable in php?

Thanks

Answer 1

To test if one variable is a reference to another you can do the following:

function is_ref_to(&$a, &$b)
{
    $t = $a;
    if($r=($b===($a=1))){ $r = ($b===($a=0)); }
    $a = $t;
    return $r;
}