What are the differences in functionality between the Premium and Free versions of the SP Project & Document Manager plugin in PHP?

The Premium version of the SP Project & Document Manager plugin offers additional features such as advanced document management capabilities, file versioning, user access control, and integration with cloud storage services. On the other hand, the Free version has basic document management functionalities with limited options for file organization and sharing.

// Example of using the Premium version features
if (is_plugin_active('sp-project-document-manager-premium.php')) {
    // Implement advanced document management functionalities here
    // File versioning, user access control, cloud storage integration, etc.
} else {
    // Implement basic document management functionalities for the Free version
    // Limited options for file organization and sharing
}