What should I do if the php file download shows that the file cannot be found?

The solution to the problem that the php file download shows that the file cannot be found: first open the corresponding download code file; then obtain the character encoding from the browser; then use the "mb_convert_encoding" function to convert the encoding; finally use "file_exists" Just download the function implementation file.

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Solution for php file download and file_exists cannot find the file

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Among them, php:

<?php
$filename = $_GET[&#39;filename&#39;];
//从浏览器获取到的字符的编码是UTF-8，我们要用这个函数转换成GBK才能才本地找到这个文件
$filename = mb_convert_encoding($filename,&#39;GBK&#39;,&#39;UTF-8&#39;);
echo $filename ."<br>";
if( empty($filename)){
    echo&#39;<script> alert("非法连接 !"); location.replace ("index.php") </script>&#39;; exit();
}
if   (!file_exists($filename))   {   //检查文件是否存在
    echo   "文件找不到";
    exit;
}   else   {
    $file = fopen($filename,"r"); // 打开文件
    // 输入文件标签
    Header("Content-type: application/octet-stream");
    Header("Accept-Ranges: bytes");
    Header("Accept-Length: ".filesize($filename));
    Header("Content-Disposition: attachment; filename=" . $filename);
    // 输出文件内容
    echo fread($file,filesize($filename));
    fclose($file);
    exit();
}
?>

Summary: If the file address passed in by the browser is not transcoded (from UTF-8 to GBK), then the file_exists function will not be able to find the file with a Chinese name.

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