Description:
------------
First problem: If I Create an array setting an element to a string and another element as a reference to the first, then copy the array into an other variable, if i modify the second variable also the original array is modified.

Second problem:
why the second code line ($a[0]="foo";) produces
  [0]=>
  &string(3) "foo"

instead of
  [0]=>
  string(3) "foo"

Thanks
Andrea Busia

Reproduce code:
---------------
<?
$a=array();
$a[0]="foo";
$a[1] =& $a[0];
var_dump($a);
$b=$a;
$b[0]="bar";
var_dump($a);
?>


Expected result:
----------------
array(2) {
  [0]=>
  string(3) "foo"
  [1]=>
  &string(3) "foo"
}
array(2) {
  [0]=>
  string(3) "foo"
  [1]=>
  &string(3) "foo"
}


Actual result:
--------------
array(2) {
  [0]=>
  &string(3) "foo"
  [1]=>
  &string(3) "foo"
}
array(2) {
  [0]=>
  &string(3) "bar"
  [1]=>
  &string(3) "bar"
}