PHP File Upload Problem. PHP may give you two types of error
Call to a member function move() to null
or
PHP - mkdir(): Permission denied
If you see the above error, that means you are having problem creating a directory. Since your server apache or nginx does not have the permission to create a directory, the move() function can not create and move a file.
In general the permission issue happens if you change server or upload your project to a completely new server.
There are a few ways to grant your apache or nginx server to create file permission. Here's how I did it.
sudo chown -R www-data /folder
Here www-data for Ubunto
sudo chown -R apache /folder
for Linux server
-R means recursively. So in general if you want to create a file inside uploads folder, then it would like below
sudo chown -R www-data /var/www/html/example.com/public/uploads
sudo chown -R apache /var/www/html/example.com/public/uploads
Folder path could be anyone for you.
There's another approach that could work as well
Last approach for changing the file creating permission is to let SELinux do it for you. But you need to assign permission to it.
chcon -R -t httpd_sys_content_t /path/to/www
chcon -R -t httpd_sys_content_rw_t /path/to/www/dir/for/rw
