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# ftp_nb_get

(PHP 4 >= 4.3.0, PHP 5)

ftp_nb_get -- Retrieves a file from the FTP server and writes it to a local file (non-blocking)

## Description

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

ftp_nb_get() retrieves `remote_file` from the FTP server, and saves it to `local_file` locally. The transfer `mode` specified must be either `FTP_ASCII` or `FTP_BINARY`. The difference between this function and the ftp_get() is that this function retrieves the file asynchronously, so your program can perform other operations while the file is being downloaded.

Returns `FTP_FAILED`, `FTP_FINISHED`, or `FTP_MOREDATA`.

例 1. ftp_nb_get() example

`<?php // Initate the download $ret = ftp_nb_get($my_connection, "test", "README", FTP_BINARY); while ($ret == FTP_MOREDATA) { // Do whatever you want echo "."; // Continue downloading... $ret = ftp_nb_continue($my_connection); } if ($ret != FTP_FINISHED) { echo "There was an error downloading the file..."; exit(1); } ?>`

例 2. Resuming a download with ftp_nb_get()

`<?php
// Initate
$ret = ftp_nb_get($my_connection, "test", "README", FTP_BINARY,
filesize("test"));
// OR: $ret = ftp_nb_get($my_connection, "test", "README",
// FTP_BINARY, FTP_AUTORESUME);
while ($ret == FTP_MOREDATA) {
// Do whatever you want
echo ".";
// Continue downloading...
$ret = ftp_nb_continue($my_connection);
}
if ($ret != FTP_FINISHED) {
echo "There was an error downloading the file...";
exit(1);
}
?>`

例 3. Resuming a download at position 100 to a new file with ftp_nb_get()

`<?php // Disable Autoseek ftp_set_option($my_connection, FTP_AUTOSEEK, false); // Initiate $ret = ftp_nb_get($my_connection, "newfile", "README", FTP_BINARY, 100); while ($ret == FTP_MOREDATA) { /* ... */ // Continue downloading... $ret = ftp_nb_continue($my_connection); } ?>`

In the example above, `"newfile"` is 100 bytes smaller than `"README"` on the FTP server because we started reading at offset 100. If we have not have disabled `FTP_AUTOSEEK`, the first 100 bytes of `"newfile"` will be `'\0'`.

See also ftp_nb_fget(), ftp_nb_continue(), ftp_get(), and ftp_fget().

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