Description:
------------
The nextRowset() function of PDO, when used with a stored procedure which returns more than 1 result set, crashes PHP with an "Access Violation" error.

I encountered this bug with the latest CVS snapshot of PHP, on IIS 5 and Windows XP. The Database is MS SQL Server 2000.

Reproduce code:
---------------
<?php

$conn = new PDO("odbc:Driver={SQL Server};Server=myserver;Database=mydb;Trusted_Connection=yes;");

$sql = 'EXECUTE Test';
$stmt = $conn->query($sql);
$i = 1;
do {
	$rowset = $stmt->fetchAll(PDO::FETCH_NUM);
	if ($rowset) {
		printResultSet($rowset, $i);
	}
	$i++;
} while ($stmt->nextRowset());

function printResultSet(&$rowset, $i) {
	print "<br />Result set $i:<br />";
	foreach ($rowset as $row) {
		foreach ($row as $col) {
			print $col . "\t";
		}
		print "<br />";
	}
	print "<br />";
}

?>

Expected result:
----------------
An output of the 3 result sets.

Actual result:
--------------
PHP has encountered an Access Violation at 010ABAEC
Result set 1:
0
1
2
7
8
9
10
11
12
13