Description:
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When calling method GtkToolbar::set_orientation() or GtkToolbar::get_orientation(), PHP throws fatal error 

Test script:
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<?php
$window1 = new GtkWindow();
$window1->connect_simple('destroy', array('Gtk', 'main_quit'));
$window1->set_size_request(100, 100);

$toolbar1 = new GtkToolbar();
$toolbar1->set_orientation(Gtk::ORIENTATION_HORIZONTAL);
$toolbar1->get_orientation();
$window1->add($toolbar1);

$window1->show_all();
Gtk::main();

Expected result:
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display window

Actual result:
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PHP Fatal error:  Call to undefined method GtkToolbar::set_orientation()