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ftp_nb_fget

(PHP 4 >= 4.3.0, PHP 5)

ftp_nb_fget -- Retrieves 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] )

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

返回值

Returns FTP_FAILED or FTP_FINISHED or FTP_MOREDATA.

范例

例子 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, $file, FTP_BINARY);
while ($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_nb_get()
ftp_nb_continue()
ftp_fget()
ftp_get()


add a note add a note User Contributed Notes
pilif at pilif dot ch
16-Nov-2004 09:53
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 > 0 ){
       // 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
add a note add a note


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