A brief analysis on solving the problem of Chinese garbled characters in PHP UTF-8

When developing web applications, the processing of Chinese character sets has always been an important part. UTF-8 is a widely used character set, and PHP, as a mainstream web programming language, also supports UTF-8 character set. But in some cases, we will encounter the problem of garbled Chinese characters. This is caused by PHP's character set processing not correctly processing UTF-8 encoded Chinese characters.

So, how to solve the problem of PHP UTF-8 Chinese garbled characters? This article will introduce them one by one.

1. Set the PHP document encoding to UTF-8

To process the UTF-8 character set in PHP, you need to set the PHP document encoding to UTF-8 at the beginning of the code. You can use the header() function to set it. The code is as follows:

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

2. Set the database encoding to UTF-8

When dealing with Chinese character sets, database encoding is also very important , needs to be correctly set to UTF-8 encoding. For example, you can use the following command in MySQL:

ALTER DATABASE db_name DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

If there is already a data table, you need to modify the data table:

ALTER TABLE table_name CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;

3. Process PHP files encoded as UTF-8

Make sure that the encoding of the PHP file itself is UTF-8, just set it through the editor or select UTF-8 encoding when exporting.

4. Use mbstring extension

PHP provides mbstring extension, which can handle UTF-8 encoded strings well, including interception, replacement, length and other operations. When using it, you need to enable the mbstring extension in the php.ini configuration file.

5. Avoid using urlencode() and urldecode() directly

The urlencode() and urldecode() functions usually cause garbled characters when processing Chinese characters. We can use rawurlencode() and rawurldecode() instead of them.

6. Use the correct output function

When outputting Chinese characters, using functions such as echo() and print() is prone to garbled characters. You can use special output Function mb_ output function, such as mb_ereg_replace, mb_convert_encoding, mb_substr, etc.

7. Avoid using expired functions

Some old functions such as iconv(), mb_convert_encoding(), utf8_decode(), etc. are prone to garbled characters when processing Chinese characters. question. Therefore, it is recommended to use new PHP functions, such as those provided in the mbstring extension.

To sum up, the problem of garbled Chinese characters in PHP is mainly due to problems in character set processing. This problem can be effectively solved by correctly setting the document encoding, database encoding, PHP file encoding, using mbstring extension, and avoiding using expired functions.

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