如何使用 mysqli 扩展在 PHP 中连接到 MySQL 数据库?

问题描述：

我有这样的代码来连接我的服务器数据库:

I have code like this to connect my server database:

<?php

$con = mysqli_connect("", "username", "password", "databasename");
if (mysqli_connect_errno()) {
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

但是显示无法连接到MySQL"，这段代码有什么问题?我第一次在 Web 服务器中尝试它，而我的本地主机运行良好.

But it displayed "Failed to connect to MySQL", what is wrong with this code? First time I am trying it in web server, whereas my localhost worked perfectly.

答

mysqli_connect("","username" ,"password","databasename");//服务器名不能为NULL

使用 loaclhost 作为服务器名称(在 Loacl 中)

use loaclhost for server name(In Loacl)

<?php
    $con = mysqli_connect("localhost","username" ,"password","databasename");

    if (mysqli_connect_errno())
    {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }
?>

或者可以使用 MySQLi Procedural

Or can use MySQLi Procedural

<?php
    $servername = "localhost";
    $username = "username";
    $password = "password";

    // Create connection
    $con = mysqli_connect($servername, $username, $password);

    // Check connection
    if (!$con) {
        die("Connection failed: " . mysqli_connect_error());
    }
    echo "Connected successfully";
?>

编辑 01

$servername = "localhost";
$username = "root";
$password = "";

如何使用 mysqli 扩展在 PHP 中连接到 MySQL 数据库?

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