通过PHP脚本从FTP服务器下载文件到带有Content-Length标题的浏览器，无需将文件存储在Web服务器上 [英] Download file via PHP script from FTP server to browser with Content-Length header without storing the file on the web server

问题描述

我使用此代码从ftp下载文件到内存：

I use this code to download a file to memory from ftp:

public static function getFtpFileContents($conn_id , $file)
{
    ob_start();
    $result = ftp_get($conn_id, "php://output", $file, FTP_BINARY);
    $data = ob_get_contents();
    ob_end_clean();
    if ($resul)
        return $data;
    return null;
}

我怎样才能让它直接发送文件给用户（浏览器）保存到磁盘并且不重定向到ftp服务器？

How can I make it directly send the file to the user (browser) without saving to disk and without redirecting to the ftp server ?

推荐答案

只需删除输出缓冲区（ ob_start（ ）和其他人）。

Just remove the output buffering (ob_start() and the others).

使用这个：

ftp_get($conn_id, "php://output", $file, FTP_BINARY);

---

虽然如果您想添加 Content-Length 头，你必须首先使用 ftp_size 查询文件大小：

---

Though if you want to add Content-Length header, you have to query file size first using ftp_size:

$conn_id = ftp_connect("ftp.example.com");
ftp_login($conn_id, "username", "password");

$file_path = "remote/path/file.zip";
$size = ftp_size($conn_id, $file_path);

header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=" . basename($file_path));
header("Content-Length: $size"); 

ftp_get($conn_id, "php://output", $file_path, FTP_BINARY);

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