ftp_nb_fget

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

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

Description

ftp_nb_fget(
    FTP\Connection $ftp,
    resource $stream,
    string $remote_filename,
    int $mode = FTP_BINARY,
    int $offset = 0
): int

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.

Parameters

ftp: An FTP\Connection instance.
stream: An open file pointer in which we store the data.
remote_filename: The remote file path.
mode: The transfer mode. Must be either FTP_ASCII or FTP_BINARY.
offset: The position in the remote file to start downloading from.

Return Values

Returns FTP_FAILED or FTP_FINISHED or FTP_MOREDATA.

Changelog

Version	Description
8.1.0	The `ftp` parameter expects an FTP\Connection instance now; previously, a resource was expected.
7.3.0	The `mode` parameter is now optional. Formerly it has been mandatory.

Examples

Example #1 ftp_nb_fget() example

<?php

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

$ftp = ftp_connect($ftp_server);

$login_result = ftp_login($ftp, $ftp_user_name, $ftp_user_pass);

// Initiate the download
$ret = ftp_nb_fget($ftp, $fp, $file, FTP_BINARY);
while ($ret == FTP_MOREDATA) {

   // Do whatever you want
   echo ".";

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

// close filepointer
fclose($fp);
?>

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User Contributed Notes 1 note

down

pilif at pilif dot ch ¶

20 years ago

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