How to Handle UTF-8 Filenames in PHP for Vietnamese Uploads?

PHP - Handling UTF-8 Filenames during Upload

When dealing with uploads that contain UTF-8 filenames, it can be challenging to ensure that the characters are preserved accurately. This is particularly relevant for languages like Vietnamese that utilize diacritics and non-Latin characters.

In PHP, handling UTF-8 filenames requires special considerations, as filesystem functions may not natively support them. As depicted in the code example provided:

<code class="php"><?php
    if(isset($_POST["submit"])) { 
       if($_FILES["upload"]["error"] > 0 ) echo "FILE ERROR!"; 
       else 
         { 
           $base_dir = "D:/"; 
           $fn = $_FILES["upload"]["name"]; 

           $fn2 = $base_dir . $fn;

           move_uploaded_file($_FILES["upload"]["tmp_name"], $fn2); 
         } 
     } 
?></code>

This code attempts to upload a Vietnamese-named file, "Tên Tệp Tiếng Việt.JPG". However, when uploaded, the resulting file name on the computer is rendered as "Tên Tệp Tiếng Việt.JPG" due to incorrect character handling.

To resolve this issue, it is necessary to convert the filename to the system's code page before handling it in PHP filesystem functions. The code page is a setting that defines the available characters in the operating system.

Depending on your specific operating system and its default code page, there are two potential solutions:

Option 1: Limit Filename Characters

This involves limiting the characters in the filename to those supported by the system code page, typically ASCII (437) in your case. While this ensures that the filename is preserved accurately, it restricts the use of certain Vietnamese characters.

Option 2: Change System Code Page

This requires changing the system code page to Vietnamese (1258) via the Regional Settings in Control Panel. Once the change is made, convert the filename to CP1258, which allows for proper handling by PHP filesystem functions.

<code class="php">$fn2 = iconv("UTF-8","cp1258", $base_dir . $fn);</code>

By choosing either of these approaches, you can ensure that Vietnamese UTF-8 filenames are handled correctly during uploads in PHP.

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