Description:
------------
Access the array using foreach, the first time is

  foreach($list as &$row)

for the second time is

  foreach($list as $row)

this time $row values ​​are incorrect

Test script:
---------------
$list = array(
  array("x" => 1),
  array("x" => 3)
);

foreach($list as &$row)
{
  if ($row["x"] == 1) $row["y"] = 10;
}

foreach($list as $row)
{
  var_dump($row);
}


Expected result:
----------------
array(2) {
  ["x"]=>
  int(1)
  ["y"]=>
  int(10)
}
array(1) {
  ["x"]=>
  int(3)
}


Actual result:
--------------
array(2) {
  ["x"]=>
  int(1)
  ["y"]=>
  int(10)
}
array(2) {
  ["x"]=>
  int(1)
  ["y"]=>
  int(10)
}