What are common reasons for receiving a 403 - Forbidden error when trying to access uploaded files through a PHP upload script?

A common reason for receiving a 403 - Forbidden error when trying to access uploaded files through a PHP upload script is incorrect file permissions set on the uploaded files or directories. To solve this issue, you need to ensure that the file permissions are set correctly to allow the web server to access the files.

// Set correct file permissions for uploaded files
chmod("path/to/uploaded/files", 0644);