How to change the address of PHP database connection

PHP is a commonly used server-side programming language capable of generating dynamic content on web pages. With the development of the Internet, PHP has become more and more widely used. The most important point is to interact with the database in order to realize data storage and retrieval. In actual use, many people will encounter a problem, that is, how to change the address of the PHP database connection. This article will explain to you the solution to this problem in detail.

First of all, we need to understand the basic process of PHP connecting to the database. Normally, we will use MySQL as our database service. In PHP, we can connect to the MySQL database through the following code:

$mysqli = new mysqli("localhost", "username", "password", "database");

Among them, "localhost" represents the IP address where the database is located, and can also be replaced by a specific IP address; "username" and "password" are the username and password of the database respectively; "database" is the name of the database to be connected. Through the above code, we can successfully connect to the MySQL database.

When we want to change the connection address, we need to pay attention to the following aspects:

1. Modify the connection address

By default, PHP will connect MySQL on local server. If you need to connect to MySQL on other servers, you need to fill in the corresponding IP address in the "localhost" position. For example:

$mysqli = new mysqli("192.168.1.1", "username", "password", "database");

2. Modify user name and password

If the user name or password of the database connection changes, corresponding modifications need to be made in the connection code. For example:

$mysqli = new mysqli("localhost", "new_username", "new_password", "database");

3. Modification of configuration file

In actual development, we usually put the database connection information in a configuration file to facilitate management and modification . At this point, you only need to modify the corresponding configuration file. For example, the following sample code:

$db_config = array(
    'database_type' => 'mysql',
    'database_name' => 'database_name',
    'server' => 'localhost',
    'username' => 'new_username',
    'password' => 'new_password',
    'charset' => 'utf8'
);

$dsn = $db_config['database_type'] . ':host=' . $db_config['server'] . ';dbname=' . $db_config['database_name'];
$pdo = new PDO($dsn, $db_config['username'], $db_config['password']);

In the above code, we store the database connection information in an array, which can be easily modified. If you need to modify the connection information, you only need to modify the corresponding item in the array.

4. Modify the MySQL configuration file

In some cases, you need to modify the connection address in the MySQL configuration file. The MySQL configuration file is usually my.ini or my.cnf, and the specific name varies according to the operating system. After opening the file, you can search for configuration items similar to the following:

bind-address = 127.0.0.1

The "127.0.0.1" here represents the IP address that MySQL monitors. If you want to change the address that MySQL monitors, you need to modify this configuration item and change the IP address to the required address.

To sum up, if you want to change the address of the PHP database connection, you can do it by modifying the connection code, configuration file or MySQL configuration file. In the process of specific application, the most suitable method should be selected and modified according to the actual situation. Through these methods, you can easily and quickly modify the address of the PHP database connection to adapt to different application scenarios.

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