This function is deprecated since PDFlib version 6, use pdf_fit_textline() for single lines, or the PDF_*_textflow() functions for multi-line formatting instead.
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. Parameter feature is optional before PHP 4.3.5 or with PDFlib less than 5.
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 formatting.