Reasons and solutions for Chinese garbled characters in PHP files

In the process of using PHP to develop websites, we often encounter the problem of Chinese garbled characters in files. This problem is not difficult to solve, but there are some issues that need to be paid attention to.

1. Cause of the problem:

1. The file encoding setting is wrong. File encoding should be set to UTF-8 (no BOM), not GB2312 or GBK.

2. The browser encoding setting is wrong. The default encoding of some browsers is GB2312 or GBK instead of UTF-8. If the charset is not specified as UTF-8 in the header of the web page, Chinese garbled characters will appear.

3. The database encoding setting is wrong. Database encoding should be set to UTF-8, not GBK or GB2312.

4. The output encoding setting is wrong. If echo outputs a string directly in a PHP file, you need to ensure that the output string encoding is UTF-8.

5. Others. For example, when an editor on the Windows platform saves a Chinese file, it may be saved in ANSI encoding, and the problem of Chinese garbled characters may also occur.

2. Solution:

1. File encoding setting error:

Set the encoding to UTF-8 in the editor, or convert the file encoding to UTF-8 (No BOM).

2. Browser encoding setting error:

Add charset=UTF-8 in the header of the web page to force the browser to use UTF-8 encoding.

header("Content-Type:text/html;charset=UTF-8");

3. Database encoding setting error:

Use the following command to modify the database encoding to UTF-8:

ALTER DATABASE dbname DEFAULT CHARACTER SET utf8;

For an existing table, modify the encoding of the table:

ALTER TABLE tablename CONVERT TO CHARACTER SET utf8;

4. Output encoding setting error:

Use the following function to convert the string to UTF-8 encoding:

$str = iconv("当前编码", "UTF-8", $str);

If the output string encoding is GBK, use it directly GB2312 encoding output.

5. Others:

Convert the file encoding to UTF-8, or use another editor.

In short, the problem of Chinese garbled characters is mostly caused by encoding setting issues. As long as the editor, PHP file, database and browser are set to UTF-8 encoding, the problem of Chinese garbled characters can be avoided.

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