php ie文件名乱码

header('Content-Type: text/html; charset=utf-8');

$filename = '测试文件.txt';
$encodedFilename = mb_convert_encoding($filename, 'UTF-8', 'GBK');

$fullPath = '/path/to/测试文件.txt';
$filename = basename($fullPath);

header('Content-Disposition: attachment; filename="' . rawurlencode($filename) . '"');

<?php
header('Content-Type: text/html; charset=utf-8');

// 假设文件名为中文
$filename = '测试文件.txt';

// 处理文件名编码
$encodedFilename = mb_convert_encoding($filename, 'UTF-8', 'GBK');

// 输出文件名
echo '原始文件名: ' . $filename . '<br>';
echo '处理后的文件名: ' . $encodedFilename . '<br>';

// 文件下载示例
header('Content-Disposition: attachment; filename="' . rawurlencode($encodedFilename) . '"');
header('Content-Type: application/octet-stream');
header('Content-Length: ' . filesize($encodedFilename));

readfile($encodedFilename);
?>