How can PHP developers troubleshoot and resolve permission errors when creating folders on a server?

When PHP developers encounter permission errors while trying to create folders on a server, they can troubleshoot and resolve the issue by ensuring that the correct permissions are set on the parent directory where the new folder is being created. They can use PHP's `mkdir()` function to create the folder and specify the correct permissions using the optional parameter.

// Specify the directory path
$directory = '/path/to/parent/directory/new_folder';

// Create the new folder with correct permissions (0777 for full access)
mkdir($directory, 0777);