mysquli error = mysqli（）：HY000 / 1045

Question

此代码在我的本地服务器上运行，但它在我的网站上无效 mysql错误1045

define("DB_HOST","localhost");
define("DB_USER","root");
define("DB_PASSWORD","xxx");
define("DB_NAME","admin00");

$db = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);