void setSpacing(float spacing);
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
swftext->setspacing() sets the current font spacing to spacing. Default is 1.0. 0 is all of the letters written at the same point. This doesn't really work that well because it inflates the advance across the letter, doesn't add the same amount of spacing between the letters. I should try and explain that better, prolly. Or just fix the damn thing to do constant spacing. This was really just a way to figure out how letter advances work, anyway.. So nyah.