Description:
------------
settype() needs a variable passed by reference.

if this variable is not defined/set, it does not throw an error. instead, and that is the bug per se, settype creates the variable passed "by reference".


Reproduce code:
---------------
<?
/* $var does not exsits, this throws an error */
var_dump($var);

/* settype should work on existing vars only (by &reference) */
$r = settype($var, "string");

/* $var does exist now */
var_dump($var);
?>


Expected result:
----------------
<br />
<b>Notice</b>:  Undefined variable: var in <b>test.php</b> on line <b>3</b><br />
NULL
<br />
<b>Notice</b>:  Undefined variable: var in <b>test.php</b> on line <b>6</b><br />
NULL


Actual result:
--------------
<br />
<b>Notice</b>:  Undefined variable: var in <b>test.php</b> on line <b>3</b><br />
NULL
string(0) ""