ftp_nb_get

Description

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.

Example 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); } ?>

Example 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); } ?>

Example 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().