How to convert php text to utf8

PHP is a very popular web development language, and most websites are developed and maintained using PHP. However, from time to time, some coding issues are encountered, especially when it comes to the development of multilingual websites. Of course, this is also a good opportunity for us to learn how to convert text in PHP to UTF-8 encoding.

In PHP, text strings are stored as byte sequences. Each character occupies 1 to 4 bytes, depending on the character set used. UTF-8 is a variable-length character encoding capable of representing all characters in the Unicode character set, including ASCII characters and non-ASCII characters.

If your PHP code and database are both stored in UTF-8 encoding, then you don't need to do any conversion of the text. But if your PHP code and database use different encoding formats, you will have to convert the text to UTF-8 encoding.

In PHP, there are several ways to convert text to UTF-8 encoding. Among them, the iconv() function and mb_convert_encoding() function are very commonly used. The use of these two methods is introduced below.

Use the iconv() function for text conversion

The iconv() function is a built-in function in PHP that can convert characters from one specified encoding to another encoding. The basic syntax of the iconv() function is as follows:

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

Among them, the $in_charset parameter represents the input character set, the $out_charset parameter represents the output character set, and the $string parameter represents the string to be converted.

The following is an example of converting text from GB2312 encoding to UTF-8 encoding:

$gbk_str = "你好，世界！";
$utf8_str = iconv("GB2312", "UTF-8", $gbk_str);
echo $utf8_str; // 输出: 你好，世界！

In the above example, the iconv() function converts the string in the $gbk_str variable from GB2312 The encoding is converted to UTF-8 encoding and the result is stored in the $utf8_str variable.

Use the mb_convert_encoding() function for text conversion

The mb_convert_encoding() function is another PHP built-in conversion function that can also convert characters from one specified encoding to another encoding. Unlike the iconv() function, the mb_convert_encoding() function can handle multiple different encoding character sets at the same time.

The basic syntax of the mb_convert_encoding() function is as follows:

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

Among them, the $str parameter represents the string to be converted, the $to_encoding parameter represents the target encoding format, and the $from_encoding parameter represents the source encoding format. If omitted, it defaults to PHP's internal encoding format.

The following is an example of converting text from GB2312 encoding to UTF-8 encoding:

$gbk_str = "你好，世界！";
$utf8_str = mb_convert_encoding($gbk_str, "UTF-8", "GB2312");
echo $utf8_str; // 输出: 你好，世界！

In the above example, the mb_convert_encoding() function converts the string in the $gbk_str variable from GB2312 The encoding is converted to UTF-8 encoding and the result is stored in the $utf8_str variable.

Conclusion

This article introduces how to convert text strings to UTF-8 encoding in PHP, mainly involving two commonly used built-in functions: iconv() function and mb_convert_encoding() function . By mastering the use of these functions, you can easily solve PHP coding problems and ensure the normal operation of multi-language websites.

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