Use the PHP function 'mysqli_close' to close the connection to the MySQL database

Use the PHP function "mysqli_close" to close the connection with the MySQL database

When using PHP to connect to the MySQL database for database operations, we need to close the connection with the database after the operation is completed to release resources, thereby improving the system Performance and security. PHP provides the function "mysqli_close" for closing the connection to the MySQL database.

The following is a sample code that shows how to use the "mysqli_close" function to close the connection to the MySQL database:

<?php
// 定义数据库连接参数
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

// 创建与数据库的连接
$conn = mysqli_connect($servername, $username, $password, $dbname);

// 检查连接是否成功
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}

// 执行数据库操作

// 关闭与数据库的连接
mysqli_close($conn);

// 其他代码
?>

In the above sample code, we first define the method used to connect to the MySQL database. Related parameters (such as server name, username, password, and database name). Then, use the function "mysqli_connect" to create a connection to the database and save the connection information in the variable "$conn".

Next, we can perform various database operations on the "$conn" variable, such as querying, inserting, updating, or deleting data. In actual applications, these operations may be more complex, and other functions can be used to perform specific database operations.

Finally, we use the function "mysqli_close" to close the connection to the MySQL database when we no longer need to interact with the database. After calling the "mysqli_close" function, the connection resources will be released and can be used for other purposes.

Please note that closing the connection to the database is not necessary, because PHP will automatically close the connection to the MySQL database after the script is executed. However, it is recommended to manually close the connection after the database operation is completed to ensure timely release of resources.

Summary:
By using the PHP function "mysqli_close", we can simply and effectively close the connection to the MySQL database. Closing connections is a good programming practice that helps improve system performance and security. In practical applications, we should close the connection to the database in time to make full use of system resources and ensure the stable operation of the application.

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