PHP: move_uploaded_file(): Unable to move '/

The error message "PHP: move_uploaded_file(): Unable to move '/path/to/temp/file' to '/path/to/destination/file'" typically occurs when the PHP script is trying to move an uploaded file from its temporary location to a new destination. but the script does not have the necessary permissions to do so.

To fix this error, you can try giving the PHP script the necessary permissions to write to the destination folder by changing the folder's permissions using chmod.

For example, if you want to give full permissions to the destination folder, you can use the following command:

chmod -R 777 /path/to/destination/folder

It's also a good practice to use a folder outside of web root to save the file and move it later to the final destination.

Note: Be careful with chmod 777, as it gives everyone full access to the folder. It is not recommended to use it in production environment.