Description:
------------
The '@' operator to not only suppresses non-fatal errors, but it seems that it changes the behaviour of the code.

I don't know if it's a bug or a normal behaviour.

The fact is that if you pass by reference an undefined index of an array to a function, that index will be defined and set to NULL.

While if you use the '@' operator, this won't happen.

See the code.

Reproduce code:
---------------
  error_reporting(E_ALL);

  print '<pre>';

  function byVal( $v) {}
  function byRef(&$v) {}

  echo "byVal(first['undefined'])\n";
  byVal ($first['undefined']);          // gives a notice
  echo "var_dump(first)\n";
  var_dump($first);                     // gives a notice

  print '<hr />';
	
  echo "byRef(second['undefined'])\n";
  byRef ($second['undefined']);         // does NOT give a notice
  echo "var_dump(second)\n";
  var_dump($second);                    // does NOT give a notice

  print '<hr />';

  echo "byRef(@third['undefined'])\n";
  byRef (@$third['undefined']);         // does NOT give a notice
  echo "var_dump(third)\n";
  var_dump($third);                     // gives a notice


Expected result:
----------------
The $second or the $third case should be wrong, IMHO.

AKAIK, the '@' operator should only suppress the notice, while it's changing the behaviour of the code, by not defining the $third array and not defining the 'undefined' index into the $third array.

I don't know if the $second case is an expected behaviour, maybe it should NOT add the 'undefined' index into the (undefined) $third array.

However, is a fact that the '@' operator makes something unexpected: it does NOT only suppress the notice.

Actual result:
--------------
byVal(first['undefined'])


Notice:  Undefined variable: first in ... on line 12

var_dump(first)


Notice:  Undefined variable: first in ... on line 14

NULL
-----------------------------------------------------
byRef(second['undefined'])
var_dump(second)
array(1) {
  ["undefined"]=>
  NULL
}
-----------------------------------------------------
byRef(@third['undefined'])
var_dump(third)


Notice:  Undefined variable: third in ... on line 28

NULL