int pdf_show_boxed (int pdf object, string text, double left, double top, double width, double height, string hmode [, string feature])
Format text in the current font and size into the supplied text box according to the requested formatting mode, which must be one of "left", "right", "center", "justify", or "fulljustify". If width and height are 0, only a single line is placed at the point (left, top) in the requested mode.
Returns the number of characters that did not fit in the specified box. Returns 0 if all characters fit or the width and height parameters were set to 0 for single-line formattting.