How to change the character set in php

PHP is a very popular server-side programming language that is widely used in web development, dynamic website construction and application development. In the PHP development process, character set (Charset) is an important concept. This article explains how to change the character set in PHP.

1. What is a character set

Character set is a mapping table used to define character encoding, that is, the process of mapping characters to binary data. Therefore each character in the character set has a unique code point.

Common character sets include ISO-8859 series, Unicode, UTF-8, etc. Unicode is an international standard character set that supports almost all languages ​​​​in the world, including Chinese. UTF-8 is one of the encoding schemes of Unicode.

2. How to set the character set in PHP

PHP is a very flexible programming language that can change the character set through built-in functions. This article will introduce the following two methods.

1. Use the header function

The header function can send the original HTTP message header to the client, including character set settings. When using this function to set the character set, you need to output the character set first, and then output the page content. The sample code is as follows:

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

Note that there cannot be any output before using the header function to set the character set. Otherwise, an error is reported.

2. Use the ini_set function

The ini_set function can set the PHP runtime configuration options, including character set settings. This method requires modifying the default character set configuration in the php.ini file, or using the ini_set function in a script to temporarily modify the character set. The sample code is as follows:

ini_set('mbstring.internal_encoding', 'utf-8');

Note that when using the ini_set function to modify the character set, you need to ensure that the configuration of the PHP server allows this function.

3. List of character sets supported by PHP

In PHP, many commonly used character sets are supported. Here are some of them:

1. ASCII
2. ISO-8859
3. UTF-8
4. UCS-4
5. GB2312
6. BIG5
7. SHIFT-JIS
8. EUC-JP

4. Conclusion

Character set for PHP application development has a vital role. PHP supports various common character sets through built-in functions, allowing developers to easily set character sets in different projects. When setting character sets, you need to pay attention to the limitations and usage requirements of different methods.

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