<?php
//Simple clock using Gtk::timeout_add()
 
//At first, we need a label displaying the time
$lbl = new GtkLabel('Clock');
//Now, call function "onTimeout" every 1 second
// (1 second == 1000 milliseconds)
//Also pass $lbl as parameter so we can
// change it in the function without using
// global variables (bad!)
Gtk::timeout_add(1000, 'onTimeout', $lbl);
 
//our callback function has one parameter,
// the one we defined in Gtk::timeout_add()
function onTimeout($lbl)
{
    //do the things we want to do
    $lbl->set_text(date('H:i:s'));
 
    //at the end, return "true" if the timeout shall
    // be executed again. If you don't return anything
    // or return false, the timeout is stopped.
    return true;
}
 
//standard stuff
$wnd = new GtkWindow();
$wnd->connect_simple('destroy', array('gtk', 'main_quit'));
$wnd->add($lbl);
$wnd->show_all();
Gtk::main();
?>