Definition and Usage
定义和用法

The ftp_nb_continue() function continues to receive/send a file to the FTP server.
ftp_nb_continue()函数的作用是：连续获取文件或将文件发送到FTP服务器。

This function returns one of the following values:
这个函数包括的值如下：

• FTP_FAILED (send/receive failed)
  FTP_FAILED (发送/获取失败)
• FTP_FINISHED (send/receive completed)
  FTP_FINISHED（发送/获取成功）
• FTP_MOREDATA (send/receive in progress)
  FTP_MOREDATA（发送/获取正在进行中）

This function sends/retrieves the file asynchronously. This means your program can perform other operations while the file is being downloaded.
这个函数对于文件的发送/获取是不同步的。它意味着：当文件正在下载时，你的程序可以运行其它操作，他们互不干扰。

Syntax
语法

ftp_nb_continue(ftp_connection)

Example
案例

<?php
$source = "source.txt";
$target = fopen("target.txt", "w");

$conn = ftp_connect("ftp.testftp.com") or die("Could not connect");
ftp_login($conn,"admin","ert456");

$status = ftp_nb_fget($conn,$source,$target,FTP_ASCII);

while ($status == FTP_MOREDATA)
 {
 $status = ftp_nb_continue($conn);
 }

if ($status != FTP_FINISHED)
 {
 echo "Download error";
 }

ftp_close($conn);
?>

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