PHP 5.4.33 Released

ftp_nb_get

(PHP 4 >= 4.3.0, PHP 5)

ftp_nb_get从 FTP 服务器上获取文件并写入本地文件(non-blocking)

说明

bool ftp_nb_get ( resource $ftp_stream , string $local_file , string $remote_file , int $mode [, int $resumepos ] )

ftp_nb_get() 函数用来获取参数 remote_file 指定的的远程文件,并保存到由参数 local_file 指定的本地文件。传输模式参数 mode 只能为 FTP_ASCII (文本模式) 或 FTP_BINARY (二进制模式) 两种。与 ftp_get() 函数不同的是,此函数上传文件的时候采用的是异步传输模式,也就意味着在文件传送的过程中,你的程序可以继续干其它的事情。

返回 FTP_FAILEDFTP_FINISHEDFTP_MOREDATA

Example #1 ftp_nb_get() 实例

<?php
// 开始下载
$ret ftp_nb_get($my_connection"test""README"FTP_BINARY);
while (
$ret == FTP_MOREDATA) {

   
// 这里可以插入其它代码
   
echo ".";

   
// 继续下载...
   
$ret ftp_nb_continue ($my_connection);
}
if (
$ret != FTP_FINISHED) {
   echo 
"下载中出错...";
   exit(
1);
}
?>

Example #2 使用 ftp_nb_get() 函数断线续传

<?php
// 开始
$ret ftp_nb_get ($my_connection"test""README"FTP_BINARY,
                      
filesize("test"));
// 或: $ret = ftp_nb_get ($my_connection, "test", "README",
//                           FTP_BINARY, FTP_AUTORESUME);
while ($ret == FTP_MOREDATA) {

   
// 可以插入其它代码
   
echo ".";

   
// 继续传送...
   
$ret ftp_nb_continue ($my_connection);
}
if (
$ret != FTP_FINISHED) {
   echo 
"下载出错...";
   exit(
1);
}
?>

Example #3 用 ftp_nb_get() 在 100 的位置断线续传并存为 "newfile"

// 禁止自动搜寻
ftp_set_option ($my_connection, FTP_AUTOSEEK, FALSE);

// 开始
$ret = ftp_nb_get ($my_connection, "newfile", "README", FTP_BINARY, 100);
while ($ret == FTP_MOREDATA) {

   ...

   // 继续下载...
   $ret = ftp_nb_continue ($my_connection);
}

在上边的例子中,"newfile" 文件比服务器上的文件 "README" 要小 100 字节。这是因为我们是从文件的偏移量 100 处开始读取的,如果没有禁止 FTP_AUTOSEEK,则 "newfile" 的前 100 字节将会是 '\0'

参见 ftp_nb_fget()ftp_nb_continue()ftp_get()ftp_fget()

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User Contributed Notes 1 note

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passerbyxp at gmail dot com
2 years ago
Note that you may have to keep calling ftp_nb_continue in order to complete the download. For example, if you do this:

<?php
ftp_nb_get
($conn,$localfile,$remotefile,FTP_BINARY)
//do some LONG time work
while(ftp_nb_continue($conn)!=FTP_FINISHED){}
?>

Your local file may only contains a few kilobytes and the later ftp_nb_continue will keep raising warning of no more data (due to connection time out, I guess).

So you may want to do this instead:

<?php
$dl
=ftp_nb_get($conn,$localfile,$remotefile,FTP_BINARY)
//part of long time work
if(ftp_nb_continue($conn)==FTP_MOREDATA) {}
//part of long time work
if(ftp_nb_continue($conn)==FTP_MOREDATA) {}
//continue to do this until you finish the long time work
while(ftp_nb_continue($conn)==FTP_MOREDATA){}
?>

This happened on my Windows XP + PHP 5.3.8 under CLI. Hope this helps someone.
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