Summarize the causes and solutions of PHP garbled code

When developing PHP, it is inevitable to encounter garbled characters. The phenomenon of garbled characters includes but is not limited to Chinese garbled characters output on web pages, Chinese garbled characters stored in databases, Chinese garbled characters in uploaded file names, etc. This article will introduce the causes and solutions of PHP garbled characters.

1. Reasons for PHP garbled characters

1. Inconsistent character encoding

There is a default character encoding in PHP, which is generally utf-8. If the character encoding of pages, databases, files, etc. is inconsistent, garbled characters will easily appear. For example, the Chinese encoding of the database is gbk, and the PHP page encoding is utf-8. When reading Chinese from the database, garbled characters will appear.

2. Improper processing

During data interaction, if Chinese characters are not processed correctly, garbled characters will also be caused. For example, when processing the uploaded file name, functions such as mb_convert_encoding() are not used for encoding conversion.

3. Problems with the program itself

Some programs themselves have encoding problems, resulting in garbled Chinese characters in certain environments. For example, some very old PHP programs will have garbled characters in modern server environments.

2. Solution to PHP garbled characters

1. Modify PHP configuration

Set the default character encoding to utf-8 in the php.ini file, you can Solve the problem of garbled characters in most cases. The specific method is as follows:

Find the php.ini file, usually in the PHP installation directory.

Edit the php.ini file, find ";default_charset = utf-8" and uncomment it.

Remove the comment from the line "default_charset = utf-8".

Restart the PHP service.

2. Use iconv or mbstring

There are two encoding conversion functions in PHP: iconv and mbstring. These two functions can convert character encoding to target encoding. The specific code is as follows:

iconv function:

$str = iconv("original encoding", "target encoding", $str);

mbstring function:

$str = mb_convert_encoding($str, "target encoding", "original encoding");

It should be noted that the mbstring function needs to enable the mbstring extension first, which can be modified through the php.ini file or in Make changes in the function.

3. Specify file encoding

If the Chinese encoding of the file you want to process is unclear or in a page that needs to output Chinese, you can specify the Chinese encoding by writing HTML header information , for example:

In this case, it is recommended to add this code at the beginning of the file to ensure that the code runs correctly.

4. Uniform Character Encoding

When exchanging data, all Chinese characters can be converted into unified encoding and then processed. This ensures coding consistency and avoids garbled code problems.

Conclusion:

PHP garbled problem is relatively common, but the solution is relatively simple and clear. Through the introduction of this article, I believe that everyone can easily solve the problem of PHP garbled code. Remember to write more code and keep learning and improving. You can also become an excellent PHP development engineer!

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