(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
ftp_nb_get — Retrieves a file from the FTP server and writes it to a local file (non-blocking)
$ftp,$local_filename,$remote_filename,$mode = FTP_BINARY,$offset = 0ftp_nb_get() retrieves a remote file from the FTP server, and saves it into a local file.
The difference between this function and ftp_get() is that this function retrieves the file asynchronously, so your program can perform other operations while the file is being downloaded.
ftpAn FTP\Connection instance.
local_filenameThe local file path (will be overwritten if the file already exists).
remote_filenameThe remote file path.
mode
The transfer mode. Must be either FTP_ASCII or
FTP_BINARY.
offsetThe position in the remote file to start downloading from.
Returns FTP_FAILED or FTP_FINISHED
or FTP_MOREDATA.
| 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.
|
Example #1 ftp_nb_get() example
<?php
// Initiate the download
$ret = ftp_nb_get($ftp, "test", "README", 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);
}
?>
Example #2 Resuming a download with ftp_nb_get()
<?php
// Initiate
$ret = ftp_nb_get($ftp, "test", "README", FTP_BINARY,
filesize("test"));
// OR: $ret = ftp_nb_get($ftp, "test", "README",
// FTP_BINARY, FTP_AUTORESUME);
while ($ret == FTP_MOREDATA) {
// Do whatever you want
echo ".";
// Continue downloading...
$ret = ftp_nb_continue($ftp);
}
if ($ret != FTP_FINISHED) {
echo "There was an error downloading the file...";
exit(1);
}
?>
Example #3 Resuming a download at position 100 to a new file with ftp_nb_get()
<?php
// Disable Autoseek
ftp_set_option($ftp, FTP_AUTOSEEK, false);
// Initiate
$ret = ftp_nb_get($ftp, "newfile", "README", FTP_BINARY, 100);
while ($ret == FTP_MOREDATA) {
/* ... */
// Continue downloading...
$ret = ftp_nb_continue($ftp);
}
?>
In the example above, newfile is 100 bytes smaller
than README on the FTP server because we started
reading at offset 100. If we didn't disable
FTP_AUTOSEEK, the first 100 bytes of
newfile would be '\0'.