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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`.

示範 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); } ?>`

示範 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); } ?>`

示範 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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