你应该做的事情如下：

$conn = MysqL_connect($host,$user,$pass);

// Always test to see if your action/connection/whatever was successful
if (!$conn) {
  // something went wrong.  handle the error
  // Display a message for the user,wrITe a message to `error_LOG()`,whatever's apPRopriate
}
else MysqL_select_db($dbname);

在生产系统上,您永远不应该显示错误,因为它可能会泄露您的代码和数据库的详细信息.相反,在PHP.ini或运行时关闭display_errors：

// In development and production,make sure all errors are reported
error_reporting(E_ALL & E_STRICT);

// In development show all errors on screen so you handle them as they occur
ini_set('display_errors',1);

// In production turn them off
ini_set('display_errors',0);

实际上,使用@的错误抑制是PHP糟糕练习in this classic question.的第二大投票