Get rows and count using PDO

UPDATE 1:

I've just noticed PDO::MYSQL_ATTR_FOUND_ROWS in the manual, but I'm not sure how 开发者_高级运维to integrate it with the code below in the original question and/or if this will answer my question?

ORIGINAL QUESTION:

I currently have the following which works, it returns rows of data:

function my_function()
{
    $DBH = new PDO( "mysql:host=server;dbname=database", "user", "pass" );
    $DBH -> setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

    $STH = $DBH -> prepare( "select * from table 1" );

    $STH -> execute();

    $ROWS = $STH -> fetchAll();

    foreach($ROWS as $ROW) {
        $output .= $ROW["col1"] . " - " . $ROW["col2"] . "<br />";
    }

    $DBH = null;

    return $output;
}

How do I get a count of the number of rows returned? I've looked into PDO's rowCount() function, but that returns rows effected on update, insert, or delete. I would like to get a count of the number of rows return from a select.

I understand I can increment an integer i.e. i++ in the loop, but that seems a little primitive. I'm guessing there is a nicer way?

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rowCount returns the number of rows matched when used with a SELECT statement.

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count($ROWS);

?