How to set gbk encoding format in php

PHP is a widely used programming language, especially suitable for web development. One of the basic tasks is dealing with Chinese encoding, especially when dealing with GBK encoding. This article will describe how to set the GBK encoding format in PHP to correctly handle Chinese characters.

What is GBK encoding

GBK encoding is a Chinese character encoding method that covers Simplified Chinese, Traditional Chinese and other Asian character sets. The GBK encoding method was originally developed in China. Its full name is "Extended National New Chinese Character Internal Code Expansion Specification". In GBK encoding, each Chinese character occupies two bytes.

Encoding settings in PHP

Encoding settings in PHP can be achieved through two constants: DEFAULT_CHARSET and DEFAULT_MIMETYPE. The DEFAULT_CHARSET constant is used to set the character set of the HTML document, while DEFAULT_MIMETYPE is used to set the MIME type of the file.

However, these two constants only work when accessing the web server, they do not affect the character set settings of PHP itself. If you want to set the character set in PHP code, you need to use the header() function to set the HTTP header information.

For example, to set the GBK encoding format, you can use the following code:

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

In this way, when the PHP script returns HTML content, the browser will parse the content in GBK encoding.

Processing GBK encoding

The core of processing GBK encoding is to use the mb_convert_encoding() function. This function converts a string from one encoding to another.

Use the following code to convert a string from UTF-8 encoding format to GBK encoding format:

$gbk_string = mb_convert_encoding($utf8_string, 'GBK', 'UTF-8');

In this example, $utf8_string is a UTF- 8 format string, and $gbk_string is the converted GBK format string.

GBK encoding and URL encoding

Since GBK encoding uses two bytes to represent a Chinese character, using GBK encoding in URLs will cause some problems. In particular, some characters are encoded as two % symbols plus two hexadecimal digits, which can cause URLs to become very long and difficult to read.

To solve this problem, you can use the urlencode() function to URL encode the string. This function converts special characters in a string to ASCII codes for use in URLs. For example, the following code will encode the string $str into a format that can be recognized by the URL:

$url_str = urlencode($str);

Summary

PHP is a programming language that is very suitable for handling Chinese encoding . When dealing with GBK encoding, you need to pay attention to character set settings and encoding conversion. With correct settings and conversions, you can ensure that PHP can handle Chinese characters correctly, resulting in a better user experience.

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