In what ways can server configurations, such as folder permissions, affect the success of a file upload script in PHP?

Server configurations, such as folder permissions, can affect the success of a file upload script in PHP by restricting the script's ability to write to certain directories. To solve this issue, you can ensure that the folder where files are being uploaded has the correct permissions set to allow the PHP script to write to it.

// Set the correct folder permissions for file uploads
chmod("uploads/", 0777);