Переименование файла при скачивании с ftp

<?php
 
ignore_user_abort(true);
set_time_limit(0); // disable the time limit for this script
 
$host = $_SERVER['SERVER_NAME'];
$path = $_SERVER['REQUEST_URI'];
 
$pieces = explode("/", $path);
 
$original_filename = $pieces[count($pieces) - 1];
$new_filename = "Новое название скачиваемого файла";
 
$fullPath = ".".$path.$dl_file; // relative path
 
if ($fd = fopen ($fullPath, "r")) { // open file for write
 
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
    
    // set headers depending of extension 
    switch ($ext) {
        case "pdf":
        header("Content-type: application/pdf");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\""); // use 'attachment' to force a file download
        break;
        case "doc":
        header("Content-type: application/msword");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\""); 
        break;
        case "docx":
        header("Content-type: application/vnd.openxmlformats-officedocument.wordprocessingml.document");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\""); 
        break;
        case "xls":
        header("Content-type: application/vnd.ms-excel");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\""); 
        break;
        case "xlsx":
        header("Content-type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\""); 
        break;
        case "ppt":
        header("Content-type: application/vnd.ms-powerpoint");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\""); 
        break;
        case "pptx":
        header("Content-type: application/vnd.openxmlformats-officedocument.presentationml.presentation");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\""); 
        break;
        // add more headers for other content types here
        default;
        header("Content-type: application/octet-stream");
        header("Content-Disposition: form-data; filename=\"$new_filename.$ext\"");
        break;
    }
 
    header("Content-length: $fsize");
    header("Cache-control: private"); //use this to open files directly
    while(!feof($fd)) {
        $buffer = fread($fd, 2048);
        echo $buffer;
    }
}
fclose($fd);
exit;

<?php
 
set_time_limit(0); // disable the time limit for this script
 
$host = $_SERVER['SERVER_NAME'];
$path = $_SERVER['REQUEST_URI'];
 
$pieces = explode("/", $path);
 
$original_filename = $pieces[count($pieces) - 1];
$new_filename = "Новое название скачиваемого файла";
 
$fullPath = ".".$path.$dl_file; // relative path
 
 
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
 
// или забить на это и везде application/octet-stream
$extMap = [
    'pdf' => 'application/pdf',
    // etc...
];
$contentType = $extMap[$ext] ?? 'application/octet-stream';
 
header("Content-type: $contentType");
header("Content-Disposition: form-data; filename=\"$new_filename.$ext\"");
header("Content-length: $fsize");
header("Cache-control: private"); //use this to open files directly
    
readfile($fullPath);