从手册 – 具有与正在执行的sql语句中的绑定参数一样多的元素的值数组.所有值都被视为PDO :: PARAM_STR.

PHP 
public function getLatestWork($numberOfSlides=10,$type=0) {
    $numberOfSlides = intval(trim($numberOfSlides));
    $STH = $this->_db->prepare("SELECT slideID
                                FROM slides
                                WHERE visible = 'true'
                                AND type = :type
                                ORDER BY order
                                LIMIT :numberOfSlides;");
    $STH->bindParam(':numberOfSlides',$numberOfSlides,PDO::PARAM_INT);
    $STH->bindParam(':type',$type,PDO::PARAM_INT);
    $STH->execute();
    $result = $STH->fetchAll(PDO::FETCH_COLUMN);
    return $result;
}
?>