Solution to the problem that ftp_put in PHP cannot upload files (picture and text)

#chown -R www-data.www-data /var/www/tmp/
#chmod -R 777 /var/www/tmp/

Upload again, successful.

At this point, the problem of not being able to upload files using ftp_put in php has been solved.

The key point of this issue: Permissions must be granted to temporarily upload the directory.