<?php
// Create a window to hold the label.
$window = new GtkWindow();
// Set up the window to close cleanly.
$window->connect_simple('destroy', array('Gtk', 'main_quit'));

// Create a label
$label = new GtkLabel('Bold Label');

// Create a Pango attribute list.
$list = new PangoAttrList();

// Create a bold Pango weight attribute.
$attr = new PangoAttrInt(Pango::ATTR_WEIGHT, Pango::WEIGHT_BOLD);

// Add the attribute to the list.
$list->insert($attr);

// Set the attributes for the label.
$label->set_attributes($list);

// Add the label to the window.
$window->add($label);

// Show the window and start the main loop.
$window->show_all();
Gtk::main();
?>