php - 删除页面中显示的 mysqli_connect 警告

Question

$mysqlServer = "***";
$mysqlDb = "***";
$mysqlUser = "***";
$mysqlPass = "***";

$conn = mysqli_connect($mysqlServer, $mysqlUser, $mysqlPass) or die("failed to connect to db");
mysqli_select_db($conn, $mysqlDb) or die("failed to connect select db");

我有这个代码，它的工作没有任何问题。但是如果我尝试输入错误的 sql server 或测试它以执行错误。这将显示：

Warning: mysqli_connect(): (HY000/2002): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
failed to connect select db

如果连接 sql 服务器出现问题，我不希望显示警告。我只想显示我自己的错误。

Answer 1

2个可能的选项：

• 将 error_reporing 级别设置为不显示警告http://php.net/manual/en/function.error-reporting.php
• @在 mysqli_connect 之前放一个符号，这会抑制警告消息

Answer 2

在每个函数前加上@符号隐藏错误

$conn = @mysqli_connect($mysqlServer, $mysqlUser, $mysqlPass) or die("failed to connect to db");

Answer 3

试试这个：

$conn = mysqli_connect($mysqlServer, $mysqlUser, $mysqlPass, $mysqlDb);

将带有连接的数据库名称作为第四个参数传递。