Why does php get garbled text? How to deal with it?

In the process of using PHP for text processing, we may encounter the situation of obtaining garbled characters. This situation will affect our business logic, so we must find a solution.

1. Causes of garbled text

1. Different encoding methods: If the encoding method of the text is inconsistent with the code, garbled characters will appear. For example, text is encoded in GB2312, while PHP code is encoded in UTF-8.
2. Network transmission problems: If the text is transmitted to our server over the network, network transmission problems may occur, causing the text to be garbled.
3. String truncation problem: In some cases, PHP will truncate the string, resulting in garbled text.

2. Methods to solve garbled text

1. Modify the PHP configuration file: You can modify the PHP configuration file (php.ini) Set the default file encoding. Find the default_charset configuration item in the php.ini file and set it to an encoding consistent with the text encoding, such as utf-8.
2. Convert encoding method: If garbled characters have occurred, you can use PHP's iconv() function to convert it to the correct encoding method. For example, convert GB2312 text to UTF-8 encoding text:

$text = iconv("GB2312", "UTF-8", $text);

3. Specify HTTP header information: When using PHP to process HTTP requests, you can specify the correct HTTP header information. encoding method. For example, specify the Content-Type part in the HTTP header information:

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

4. Use file header information: When using PHP to handle file reading, you can use file header information to specify the correct encoding. Way. For example, when reading a UTF-8 encoded text file, you need to specify the use of UTF-8 encoding in the file header information:

$file = fopen("filename.txt", "r");
fgetss($file, 4096, "UTF-8");
fclose($file);

5. Use JSON format: When using PHP to process JSON When formatting data, you can use the json_encode() and json_decode() functions to encode and decode. These functions will automatically handle the encoding method to avoid the problem of garbled text.

$json = json_encode($data);
$data = json_decode($json, true);

3. Summary

To deal with text garbled problems in PHP, you need to understand the basic knowledge of text encoding and related functions and methods. By adjusting configuration files, converting encoding methods, specifying HTTP header information, etc., you can effectively solve the problem of garbled text. However, when processing text, we also need to pay attention to issues such as file header information and string truncation to ensure the correctness of text processing.

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