php文件下载+重命名+文件下载乱码问题

if (!file_exists($file)) {
echo "erro";
exit ();
} else {
$fl = fopen( $file, "r" );
header("Content-Type:application/octet-stream");
header("Accept-Ranges: bytes");
header("Accept-Length:".filesize($file));
header("Content-Disposition:attachment;filename=".$filename);
ob_clean();
flush();
echo fread($fl, filesize($file));
fclose($fl);
exit();
}

$file是文件路径，比如：/images/file/20180115/20180115124548_49942.doc

$filename是重命名的名字

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感谢支持与鼓励～