Definition and Usage
定义和用法

The ftp_nb_fget() function gets a file from the FTP server and saves it to an open file.
ftp_nb_fget()函数的作用是：从 FTP 服务器上下载一个文件并保存到本地一个已经打开的文件中 (non-blocking)。

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）

Unlike ftp_fget(), this function retrieves the file asynchronously. This means your program can perform other operations while the file is being downloaded.
与ftp_fget()函数不同，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_fget(ftp_connection,remote,local,mode,resume)

Example
案例

This example copies the text from "source.txt" into "target.txt":
这个案例将“source.txt”的文本内容复制到“target”：

<?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");

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

ftp_close($conn);
?> 

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