How to modify garbled characters in php

php is a popular programming language used to develop interactive network applications, such as websites. However, when dealing with non-English languages, php will encounter the problem of garbled characters, especially when dealing with Chinese. In this article, we will explore the causes of garbled characters in PHP and how to solve this problem.

1. Cause of garbled characters

The main reason for garbled characters in php is coding mismatch. PHP uses UTF-8 encoding by default, but if the encoding format of the text is different from PHP's default encoding, garbled characters will appear. Common non-UTF-8 encoding formats include GBK, GB2312, BIG5, etc.

In addition, it may also be because the data encoding format stored in the database is inconsistent with that used in the PHP program, resulting in garbled characters. To address this problem, you need to check the database encoding and the encoding format of the PHP program.

2. Solution

2.1 Specify encoding format

If we know the actual encoding format of the file or data, we can solve the garbled code by manually specifying the encoding format question. For example, if the database uses GBK encoding, you can use iconv(), mb_convert_encoding(), iconv() and other functions in the PHP program to convert the encoding format to UTF-8 to ensure correct output.

For example, the following example converts a GBK-encoded string to UTF-8 encoding:

$string = iconv("GBK", "UTF-8", $string);

Or use the following function:

$string = mb_convert_encoding($string, "UTF-8", "GBK");

2.2 Set HTTP header information

In php, you can also use the header() function to set HTTP header information, including Content-Type, Content-Language, charset, etc., to ensure correct output.

For example, the following example sets the page encoding to UTF-8:

header("Content-Type:text/html;charset=UTF-8");

2.3 Modify the php.ini file

The default encoding of php is UTF-8, so if you It has been confirmed that the encoding of the data or file is UTF-8, but garbled characters still appear. It may be because the character set in the php.ini file is incorrectly set.

Open the php.ini file and find the following line:

default_charset = "UTF-8"

Make sure the line is correctly set to UTF-8, if not, modify the behavior:

default_charset = "UTF-8"

2.4 Use Database connection settings

You can specify the character set encoding in the database connection settings to ensure correct output. For example, if you use mysqli to connect to the MySQL database, you can set the following code:

mysqli_set_charset($conn,"utf8");

Among them, $conn is the variable name to connect to the MySQL database.

3. Conclusion

To solve the garbled code problem in PHP, you need to understand the reasons for the garbled code, including mismatch in encoding format and inconsistency between the data encoding format stored in the database and that used in the PHP program. . To solve this problem, we can manually specify the encoding format or set HTTP header information in PHP to ensure correct output. We can also modify the character set settings in the php.ini file or use the database connection settings to ensure correct output.

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