Description:
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In the example 1681 (here:  http://www.php.net/manual/en/function.PDOStatement-fetch.php) we can read this :

$stmt = $dbh->prepare($sql, array(PDO::ATTR_CURSOR, PDO::CURSOR_SCROLL));

[later in the example]

$stmt = $dbh->prepare($sql, array(PDO::ATTR_CURSOR, PDO::CURSOR_SCROLL));

But the doc for PDO::prepare() (here: http://www.php.net/manual/en/function.PDO-prepare.php ) says :

driver_options

"This array holds one or more key=>value pairs to set attribute values for the PDOStatement object that this method returns. You would most commonly use this to set the PDO::ATTR_CURSOR value to PDO::CURSOR_SCROLL to request a scrollable cursor. Some drivers have driver specific options that may be set at prepare-time."

Thus, it should be for the two lines.

$stmt = $dbh->prepare($sql, array(PDO::ATTR_CURSOR =>  PDO::CURSOR_SCROLL));