How to avoid Chinese garbled characters in PHP and MySQL

How to avoid Chinese garbled characters in PHP and MySQL

With the development and popularity of the Internet, more and more websites and applications use PHP as the back-end language. MySQL serves as a database management system. However, in the process of using PHP and MySQL, we often encounter the problem of garbled Chinese characters, which brings a lot of trouble to developers. This article will introduce some methods to solve the problem of Chinese garbled characters to help developers avoid this phenomenon.

1. Set database character set

When creating databases and data tables, you need to explicitly specify the character set as utf8 or utf8mb4 to support the storage and display of Chinese characters. You can use the following SQL statement when creating a database:

CREATE DATABASE dbname DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

You can use the following SQL statement when creating a data table:

CREATE TABLE tablename (
    id INT PRIMARY KEY,
    content TEXT
) DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

Through the above operations, you can ensure that the character set of the database and data table is correctly set. , to avoid the problem of Chinese garbled characters.

2. Set the PHP connection database character set

When PHP connects to the MySQL database, you need to set the connection character set to utf8 or utf8mb4 to ensure data between PHP and MySQL The transmission will not be garbled. You can add the following code when connecting to the database:

$mysqli = new mysqli("localhost", "username", "password", "dbname");
if ($mysqli->connect_error) {
    die("连接失败: " . $mysqli->connect_error);
}

$mysqli->set_charset("utf8");

Through the above code, you can ensure that PHP uses the utf8 character set when connecting to MySQL to avoid Chinese garbled characters.

3. Set the PHP page character set

In the PHP page, you need to set the page character set to utf-8 to ensure that the browser correctly parses Chinese characters. You can add the following code to the header of the page:

header('Content-Type: text/html; charset=utf-8');

Through the above code, you can ensure that the character set of the PHP page is utf-8 to avoid the problem of Chinese garbled characters.

4. Processing data input and output

When processing Chinese data submitted from a form in PHP, you need to ensure that the data is correctly encoded. You can use the following code to convert the data encoding:

$content = $_POST['content'];
$content = mb_convert_encoding($content, 'UTF-8', 'GBK');

When outputting data to the page, you also need to ensure correct encoding output to avoid the problem of Chinese garbled characters. You can use the following code for encoding output:

echo mb_convert_encoding($content, 'UTF-8', 'GBK');

Through the above operations, you can ensure that the encoding conversion of data is processed correctly and avoid the occurrence of Chinese garbled characters.

Summary:

To avoid the problem of Chinese garbled characters in PHP and MySQL, we need to start from many aspects, including setting the database character set, PHP connecting database character set, setting the page character set and processing data input and output. etc. Through the implementation of the above methods, the problem of Chinese garbled characters can be effectively avoided, ensuring that websites and applications can correctly display Chinese content and improving user experience. I hope the content of this article will be helpful to avoid Chinese garbled problems in PHP and MySQL.

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