The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
See ftp_set_option() for information.
The following constants were introduced in PHP 4.3.0.
Automatically determine resume position and start position for GET and PUT requests
(only works if FTP_AUTOSEEK is enabled)
Asynchronous transfer has failed
Asynchronous transfer has finished
Asynchronous transfer is still active