The functions in this extension implement client access to files
servers speaking the File Transfer Protocol (FTP) as defined in
» https://datatracker.ietf.org/doc/html/rfc959. This extension is
meant for detailed access to an FTP server providing a wide range
of control to the executing script. If you only wish to
read from or write to a file on an FTP server, consider using
the ftp:// wrapper
with the filesystem functions
which provide a simpler and more intuitive interface.