Reasons and solutions for garbled characters written to txt files using PHP

Causes and solutions for garbled txt files written by PHP

During the development process, we often use PHP to write text files, but sometimes we may encounter Garbled characters appear after writing. This kind of problem usually causes headaches for developers, so this article will explore the reasons and solutions for garbled characters written into txt files by PHP, and provide specific code examples.

Analysis of causes of garbled characters

1. Inconsistent file encoding: The encoding of the written text file and the PHP script are inconsistent, causing the written content to appear when reading Garbled characters;
2. The written content contains special characters: The written content contains special characters, such as Chinese, special symbols, etc., and PHP's default file encoding may be inconsistent with the system encoding , resulting in garbled characters;
3. The encoding is not specified when PHP writes the file: The encoding is not specified when PHP writes the file, causing the system to automatically select the default encoding method to write the file, which may conflict with The encoding of the file itself is inconsistent and garbled characters are produced.

Solution

1. Specify the encoding to write to the file

When using the file_put_contents() function, we can specify the third Parameter FILE_APPEND | LOCK_EX to specify the encoding of the written file to avoid garbled characters.

$content = "写入内容";
file_put_contents('file.txt', $content, FILE_APPEND | LOCK_EX);

2. Use the fwrite() function and specify the encoding

When using the fwrite() function to write a file, you can specify the encoding at the same time , ensuring that the encoding of the written content is consistent with the file.

$handle = fopen('file.txt', 'a');
fwrite($handle, utf8_encode($content));
fclose($handle);

3. Unified encoding format

Before writing, the content can be encoded and unified into UTF-8 encoding:

$content = "写入内容";
$content = mb_convert_encoding($content, "UTF-8");
file_put_contents('file.txt', $content, FILE_APPEND | LOCK_EX);

4. Set HTTP Header information

Set HTTP header information in the PHP file header to ensure that UTF-8 encoding is used when writing the file:

header('Content-Type: text/plain; charset=UTF-8');
$content = "写入内容";
$content = mb_convert_encoding($content, "UTF-8");
file_put_contents('file.txt', $content, FILE_APPEND | LOCK_EX);

Summary

When using PHP to write txt files It is common to encounter garbled code problems. Through several solutions introduced in this article, we can effectively avoid garbled characters when writing files and ensure the integrity and accuracy of the written content. I hope this article can help developers with similar problems and make our file operations smoother!

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