If you are moving files from one folder to another inside the same server, the "local file" field has to be indicated in a relative path according to the location of the script running the ftp_put() function.
For example, your function is running on: /public_html/do_ftp.php and you want to move /public_html/products.php to /public_html/backup/products.php
The correct way to build the function would be:
ftp_put($ftp_id, '/public_html/backup/products.php', 'products.php', FTP_ASCII);
After having headaches for 2 days trying to make this function work using absolute paths in both fields, I finally found the right way to use it. I hope it helps someone. Excuse my english, it isn't my native language.
