How does phpGTK handle cross-platform compatibility and what are the implications for developers in terms of deployment and maintenance?

phpGTK handles cross-platform compatibility by providing a set of functions and classes that abstract the underlying operating system differences. This allows developers to write code that works on multiple platforms without needing to make significant changes. The implications for developers are that they can write code once and deploy it on different operating systems without having to rewrite or maintain separate codebases.

// Example of using phpGTK to create a cross-platform GUI window
$window = new GtkWindow();
$window->set_title("Hello World");
$window->connect_simple('destroy', array('Gtk', 'main_quit'));

$button = new GtkButton('Click Me');
$button->connect_simple('clicked', function() {
    echo "Button clicked!";
});

$window->add($button);
$window->show_all();
Gtk::main();