I'm using XAMPP on my CentOS server. I just wrote a simple file upload script with PHP but there is a problem using mkdir() function, because of the error below:
Warning: mkdir(): Permission denied in /opt/lampp/htdocs/script.php on line 10
Also I can not use move_uploaded_file, because of the same problem.
How can I fix this issue?
You need to give permission to your web server or www folder like this, here www-data is apache group and user, make sure you have one apache user and group.
chown -R www-data:www-data /path/to/webserver/www
chmod -R g+rw /path/to/webserver/www
In your case
chmod -R g+rw /opt/lampp/htdocs