PHP array

<?php

function retrieveEntries($db, $id=NULL)
{
    /*
     * If an entry ID was supplied, load the associated entry
     */
    if(isset($id))
    {
        $sql = "SELECT title, entry
                FROM entries
                WHERE id=?
                LIMIT 1";
        $stmt = $db->prepare($sql);
        $stmt->execute(array($_GET['id']));

        // Save the returned entry array
        $e = $stmt->fetch();

        // Set the fulldisp flag for a single entry
        $fulldisp = 1;
    }

    /*
     * If no entry ID was supplied, load all entry titles
     */
    else
    {
        $sql = "SELECT id, title
                FROM entries
                ORDER BY created DESC";

        // Loop through returned results and store as an array
        foreach($db->query($sql) as $row) {
            $e[] = array(
                'id' => $row['id'],
                'title' => $row['title']
            );
        }

        // Set the fulldisp flag for multiple entries
        $fulldisp = 0;

        /*
         * If no entries were returned, display a default
         * message and set the fulldisp flag to display a
         * single entry
         */
        if(!is_array($e))
        {
            $fulldisp = 1;
            $e = array(
                'title' => 'No Entries Yet',
                'entry' => '<a href="admin.php">Post an entry!</a>'
            );
        }
    }

    // Add the $fulldisp flag to the end of the array
    array_push($e, $fulldisp);

    return $e;
}

function sanitizeData($data)
{
    if(!is_array($data))
    {
        return strip_tags($data, "<a>");
    }
    else
    {
        return array_map('sanitizeData', $data);
    }
}

?>