PHP link database is garbled

In the process of using PHP to connect to the database, it is easy to encounter garbled characters. This is caused by incorrect character set settings when PHP communicates with the database. The following methods can be used to solve this problem.

1. Check the database character set settings
   If garbled characters appear when reading the database, we can first check the database character set settings. Use the following statement to view the current database default character set.

SHOW VARIABLES LIKE '%character_set_database%';

If it is not set to utf8 encoding, you need to change it to utf8. Use the following statement to modify the database character set:

ALTER DATABASE [数据库名称] CHARACTER SET utf8;

2. Set PHP character set
   Add the following code at the top of the PHP page to set the page character set to utf-8.

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

3. Set the database connection character set
   When connecting to the database in PHP, you need to set the database connection character set. Use the following statement to set the link character set:

mysqli_set_charset($link, 'utf8');

where $link is the database link object.

4. When inserting and querying data, set the character set
   When inserting and querying data, you also need to set the character set. The character set can be set using the following statement:

mysqli_query($link, "SET NAMES 'utf8'");

where $link is the database link object.

To sum up, if the PHP link database has garbled characters, it can be solved by the above method. It should be noted that the above methods need to be used with caution to avoid data damage caused by incorrect modifications. It is recommended to test in the test environment first, and then apply it to the production environment after confirming that it is correct.

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