Solution to the problem that the file_exists function in PHP cannot detect file names containing Chinese characters

File_exists() is generally used in PHP to determine whether a file or folder exists. If the file or folder exists, it returns true, and if it does not exist, it returns false. Today when implementing the file download function, I found that when the web page uses UTF8 encoding, the function cannot detect whether the file containing Chinese exists and always returns false. After a long time of modification, I discovered that it was because the full path was not encoded. Simply transcoding the file name was not enough.

The following code cannot detect whether a file containing Chinese exists, and returns false regardless of whether the file exists:

 <?php;
   $file=&#39;../uploads/file/中文.pdf&#39;;    //  在../uploads/file/文件夹中  中文.pdf   实际存在

   echo file_exists($file);    //输出为false
 ?>

Just transcoding the file name will not work. This is the situation I encountered, and I need to put [ Path + file name] can be transcoded together

<?php
   $file= &#39;中文.pdf&#39;;    //  在../uploads/file/文件夹中  中文.pdf   实际存在
   $file=iconv(&#39;UTF-8&#39;,&#39;GB2312&#39;,$file);
   echo file_exists(&#39;../uploads/file/&#39; . $file);    //输出为false
?>

In fact, as long as the file path and file name are converted from UTF8 encoding to GB2312 encoding, after the improvement, you can accurately judge:

<?php
    $file=&#39;../uploads/file/中文.pdf&#39;;    //  在../uploads/file/文件夹中  中文.pdf   实际存在
    $file=iconv(&#39;UTF-8&#39;,&#39;GB2312&#39;,$file);
    echo file_exists($file); //输出为true
?>  

The above introduces the solution to the problem that the file_exists function in PHP cannot detect file names containing Chinese characters, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.