PHP and MySQL garbled troubleshooting and solution tips sharing

Sharing of PHP and MySQL garbled code troubleshooting and solution techniques

In developing websites or applications, it often involves using PHP to interact with MySQL databases. However, sometimes you encounter the problem of garbled characters, that is, the data stored in the database is displayed in garbled characters on the PHP page. This article will introduce in detail the problem of garbled characters in PHP and MySQL, and share solving techniques and specific code examples to help readers better troubleshoot and solve this common problem.

1. Problem Analysis

Garbled code problems are often caused by factors such as inconsistent character encoding, inconsistent database and page character set settings, and incorrect data transcoding. During the interaction between PHP and MySQL, the following aspects may cause garbled characters:

• The database character set is incorrectly set;
• The database connection does not set the character set correctly;
• The PHP page is inconsistent with the database character set;
• The data is not correctly encoded during data transmission.

2. Solution

2.1 Confirm the database character set setting

First, you need to ensure that the character set setting of the MySQL database is correct. You can view the character set settings of the database through the following SQL query:

SHOW VARIABLES LIKE 'character_set_database';

If the database character set is not the expected character set (such as UTF-8), you can use the following command to modify the database character set:

ALTER DATABASE database_name CHARACTER SET utf8 COLLATE utf8_general_ci;

2.2 Set the database connection character set

In PHP, the correct character set should be set when connecting to the database. You can execute the following statement before connecting to the database:

$connection = new mysqli("localhost", "username", "password", "database");
$connection->set_charset("utf8");

2.3 Confirm the page character set Consistent with the database character set

In the PHP page, you need to ensure that the character set is the same as the database. You can add the following code in the tag of the page:

<meta charset="utf-8">

2.4 Encoding conversion during database operations

When performing database queries, insertions, updates, etc. When doing this, it is necessary to ensure that the encoding of the data is consistent. You can use the mb_convert_encoding function in PHP to convert the data encoding:

$str = mb_convert_encoding($str, "UTF-8", "GB2312");

3. Sample code

Assume that there is a table with Chinese content stored in the MySQL database. example_table, you can use the following PHP code to query and output the contents of the table:

$connection = new mysqli("localhost", "username", "password", "database");
$connection->set_charset("utf8");

$sql = "SELECT * FROM example_table";
$result = $connection->query($sql);

while ($row = $result->fetch_assoc()) {
    $content = $row['content'];
    echo $content;
}

Through the above code example, we can correctly query and display Chinese content from the database to avoid garbled code problems .

4. Summary

In the development process of PHP and MySQL, garbled characters are a common challenge. By correctly setting the database character set, connection character set, page character set and timely encoding conversion, you can effectively avoid the occurrence of garbled characters. At the same time, following the above tips and combining them with actual application scenarios will help ensure the correct display and interaction of data. I hope that the sharing of this article can help readers better solve the garbled problem of PHP and MySQL and improve development efficiency and user experience.

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