How to convert encoding in php

PHP is a very popular server-side scripting language used for developing websites and web applications. When developing and working on web applications, it is often necessary to convert text encodings to ensure that data is transmitted correctly and displayed correctly. This article will introduce how to convert encoding in PHP.

1. Introduction to Character Encoding

In Web development, character encoding is very important. Different encoding methods use different binary encodings to represent different characters or symbols. Common encoding methods include ASCII, UTF-8, GB2312, GBK, etc. Among them, UTF-8 is a universal encoding method that is widely used in current Web development.

2. Encoding conversion functions in PHP

PHP provides many functions for converting encodings. The following are some commonly used functions:

(1) iconv

iconv can convert a string in one character set into a string in another character set. The syntax format is as follows:

string iconv(string $in_charset, string $out_charset, string $str);

Among them, $in_charset and $out_charset specify the character set and target character set that need to be converted. $str is the string that needs character set conversion.

For example, convert a UTF-8 encoded string into a GBK encoded string:

$str = "PHP转换编码示例";
$gbk_str = iconv("UTF-8", "GBK", $str);

(2) mb_convert_encoding

The mb_convert_encoding function is similar to the iconv function and provides Character set conversion function. The syntax format is as follows:

string mb_convert_encoding(string $str, string $to_encoding [, mixed $from_encoding = mb_internal_encoding()]);

Among them, $str is the string that needs to be converted into character set, $to_encoding is the target encoding method, $from_encoding is the original encoding method (optional parameter, default is the default of the current PHP environment Encoding).

For example, convert a GBK-encoded string into a UTF-8-encoded string:

$str = "PHP转换编码示例";
$utf8_str = mb_convert_encoding($str, "UTF-8", "GBK");

3. Encoding conversion example

The following is a simple An example of encoding conversion, convert a GB2312 encoded string into a UTF-8 encoded string, and output the result:

// 原始字符串
$str = "PHP转换编码示例";

// 将GB2312编码的字符串转换成UTF-8编码的字符串
$utf8_str = iconv("GB2312", "UTF-8", $str);

// 输出转换后的字符串
echo $utf8_str;

Execute the above PHP code, the converted string "PHP Conversion" will be output Coding Example".

4. Summary

In PHP development, it is often necessary to convert character encodings to ensure that data can be transmitted and displayed correctly. This article introduces the commonly used encoding conversion functions iconv and mb_convert_encoding in PHP, as well as a simple encoding conversion example. I hope it will be helpful to you.

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