Description:
------------
Associative array reference, e.g.

    $monIdx = $sti["Mar"];

behaves as expected if array $sti has local scope, but if the line of code above appears within a function and $sti is declared outside the function, you get nothing .



Reproduce code:
---------------
$sti = array( "Jan" =>  1, "Feb" =>  2, "Mar" =>  3,
              "Apr" =>  4, "May" =>  5, "Jun" =>  6,
              "Jul" =>  7, "Aug" =>  8, "Sep" =>  9,
              "Oct" => 10, "Nov" => 11, "Dec" => 12  );
function foobar( $monSt )
{
   return $sti[$monSt];
}
$res = foobar( "May" );
echo "res=$res<br>\r\n";

Expected result:
----------------
res=5<br>\r\n

Actual result:
--------------
res=<br>\r\n