For gtk+, it's possible to simiulate a keypress by emitting a GdkEvent manually. But for php-gtk, I haven't found a way yet.

However, for many applications, usually you will have a "key-press-event" signal handler to handle all the keypresses. For each keypress, you will have a corresponding action.

For example, suppose
keypress "a" corresponds to action_a()
keypress "b" corresponds to action_b()
keypress "c" corresponds to action_c()

Now if you want keypress "m" to be the same as keypress "a", followed by "b", and then "c". Instead of simulating keypress "a", "b" and "c", for signal handler of keypress "k", you can do a sample

function action_k() {
action_a();
action_b();
action_c();
}

I know it's a bit different from what you have in mind. But I think this method will work for most of the cases.

Regards,
/kksou