FTP 函数
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ftp_nb_fget

(PHP 4 >= 4.3.0, PHP 5)

ftp_nb_fgetRetrieves a file from the FTP server and writes it to an open file (non-blocking)

说明

int ftp_nb_fget ( resource $ftp_stream , resource $handle , string $remote_file , int $mode [, int $resumepos = 0 ] )

ftp_nb_fget() retrieves a remote file from the FTP server.

The difference between this function and ftp_fget() is that this function retrieves the file asynchronously, so your program can perform other operations while the file is being downloaded.

参数

ftp_stream

The link identifier of the FTP connection.

handle

An open file pointer in which we store the data.

remote_file

The remote file path.

mode

The transfer mode. Must be either FTP_ASCII or FTP_BINARY.

resumepos

The position in the remote file to start downloading from.

返回值

Returns FTP_FAILED or FTP_FINISHED or FTP_MOREDATA.

范例

Example #1 ftp_nb_fget() example

<?php

// open some file for reading
$file 'index.php';
$fp fopen($file'w');

$conn_id ftp_connect($ftp_server);

$login_result ftp_login($conn_id$ftp_user_name$ftp_user_pass);

// Initate the download
$ret ftp_nb_fget($conn_id$fp$fileFTP_BINARY);
while (
$ret == FTP_MOREDATA) {

   
// Do whatever you want
   
echo ".";

   
// Continue downloading...
   
$ret ftp_nb_continue($conn_id);
}
if (
$ret != FTP_FINISHED) {
   echo 
"There was an error downloading the file...";
   exit(
1);
}

// close filepointer
fclose($fp);
?>

参见


FTP 函数
在线手册:中文  英文

用户评论:

pilif at pilif dot ch (2004-11-16 05:53:34)

If you want to monitor the progress of the download, you may use the filesize()-Function.

But note: The results of said function are cached, so you'll always get 0 bytes. Call clearstatcache() before calling filesize() to determine the actual size of the downloaded file.

This may have performance implications, but if you want to provide the information, there's no way around it.

Above sample extended:

<?php
// get the size of the remote file
$fs ftp_size($my_connection"test");

// Initate the download
$ret ftp_nb_get($my_connection"test""README"FTP_BINARY);
while (
$ret == FTP_MOREDATA) {
   
   
clearstatcache(); // <- this is important
   
$dld filesize($locfile);
   if ( 
$dld ){
       
// calculate percentage
       
$i = ($dld/$fs)*100;
       
printf("\r\t%d%% downloaded"$i);
   }   

   
// Continue downloading...
   
$ret ftp_nb_continue ($my_connection);
}
if (
$ret != FTP_FINISHED) {
   echo 
"There was an error downloading the file...";
   exit(
1);
}
?>

Philip

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