What is the difference between ftp_fput vs ftp_put?

ftp_fput() expects an open resource and ftp_put() just use a (local) filename

ftp_put($foo, $bar, $filename, $baz);
ftp_fput($foo, $bar, fopen($filename, 'r+b'), $baz);

• ftp_fput
  • "Uploads from an open file to the FTP server"
• ftp_put
  • "Uploads a file to the FTP server"

More specifically, ftp_fput takes a resource created with fopen as the file to upload where as ftp_put takes the filename as a string.