How to solve the problem of Japanese garbled characters in files uploaded by PHP

Recently, a friend asked me a question, that is, when using php to upload files containing Japanese character names, garbled characters will appear. This is because uploading files requires a series of transcoding processes. If there is a problem in any link, the file name will be garbled.

1. File upload process

Before understanding the solution to the garbled code problem, we need to understand the basic process of file upload. Generally, the file upload process is divided into the following three steps:

1.1 Form submission

In the html form, we need to add an input tag with the type attribute "file". This tag allows users to select uploaded files through the browser.

1.2 File reading

When the user selects the file and clicks the submit button, the server starts to read the uploaded file. During this time, uploaded files are cached in the server's temporary folder.

1.3 Save the file

After reading the file, the server saves it in the specified location and stores the file name and file path in the database for subsequent use.

2. Japanese garbled code problem

In Japanese, there are a variety of special characters, which require specific encoding methods to be correctly recognized and displayed. If these special characters are not encoded correctly during file upload, garbled characters will result.

The problem generally occurs in the encoding of the file name and the encoding of the file content. For file name encoding, UTF-8 encoding is generally used. In Japanese, the encoding method used is generally Shift_JIS. When reading these file names, they need to be converted to UTF-8 encoding first. If this operation is not done, the file name will be garbled.

In terms of encoding of file content, if the uploaded file is in plain text format, transcoding is generally required. If the file content is not correctly converted from Shift_JIS to UTF-8, it will cause the file content to be garbled.

3. Solution to the problem of Japanese garbled characters

In order to solve the problem of Japanese garbled characters, we need to perform corresponding encoding and decoding during the process of uploading, reading and saving files. operate. In general, the following solutions can be used:

3.1 Add encoding type to the form

In the html form, we need to add the enctype attribute and set its value to "multipart/form -data". When submitting a form in this way, the server can correctly parse the uploaded file information.

3.2 Add encoding when reading files

When the server reads the uploaded file, it needs to convert the file name to UTF-8 encoding first. This process can be accomplished using the iconv or mbstring functions. For example, you can use the following code to convert a Shift_JIS encoded file name to UTF-8 encoding:

$file_name = iconv("SHIFT-JIS", "UTF-8", $file_name);

3.3 Add the encoding method when saving the file

When saving the file, the encoding of the file needs to be converted according to the specific situation. If it is a file in plain text format, you can use functions such as iconv or mbstring to convert it from Shift_JIS encoding to UTF-8 encoding. If it is a file of other types, you can use the iconv_mime_decode function to convert it to UTF-8 encoding.

In short, ensuring that corresponding encoding and decoding operations are performed in every link of file upload is the key to solving the problem of Japanese garbled characters. As long as the specific situation is dealt with accordingly, this problem can be better solved.

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