Change size of GtkWindow in PHP GTK

In this post we use void set_size_request(int width, int height) to change the size of GtkWindow in PHP GTK

<?php
/* 
PHP GTK tutorials
website: http://phpgtktutorials.blogspot.in/
*/
$window = new GtkWindow();
$window->set_size_request(400, 100);

$window->connect_simple('destroy', array('Gtk','main_quit'));
$label = new GtkLabel("PHP GTK Tutorials and Examples!");
$window->add($label);
$window->show_all();
Gtk::main();
?>