Ubuntu 14.04, wxPHP 3.0.0.2, wxWidgets 3.0.2, xbindkeys 1.8.6 (for creating user hotkeys)
xbindkeys is set up to output a preset string when a special key combination is pressed.
xbindkeys works for Ubuntu apps, but it doesn't seem to work for entering text in wxPHP apps.
system hotkeys, like Control+C and Control+V, work OK.

I think xbindkeys must get its keystrokes by way of the dbus session bus.
Does wxWidgets in GTK mode get its keyboard input by way of dbus and xbindkeys?

<?php
$frame = new wxFrame(null, wxID_TOP, "Enter text");
$hbox = new wxBoxSizer(wxHORIZONTAL);
    $label = new wxStaticText($frame, wxID_ANY, "Email:", wxDefaultPosition, wxDefaultSize);
$hbox->Add( $label, 0, wxALL, 10);
    $textbox = new wxTextCtrl($frame, wxID_ANY, "", wxDefaultPosition, new wxSize(300, 28) );
$hbox->Add( $textbox, 0, wxALL, 10);
$frame->SetSizer($hbox);
$frame->Show();
wxEntry();
?>