Why does PHP overwrite values when I iterate through this array twice (by reference, by value)

Question

If I iterate through an array twice, once by reference and then by value, PHP will overwrite the last value in the array if I use the same variable name for each loop. This

Answer 1

This is how you would fix this problem:

foreach($array as &$element)
{
    $element *= 2;
}
unset($element); #gets rid of the reference and cleans the var for re-use.

foreach($array as $element) { }