Mine

<?php
  $wnd = new GtkWindow();
  $prg = new GtkProgressbar();
  $prg->set_pulse_step(0.1);
  $wnd->add($prg);
  $wnd->show_all();
  gtk::timeout_add(200,"pulse",$prg);
  gtk::main();
  function pulse($prg){
    $prg->pulse();
    return true;
  }
?>