While it does slightly increase the amount of effort required to work with PHP, it has been argued that the benefits far outweigh the effort.

ע An alternative PHP module for PDF document creation based on FastIO's ClibPDF is available. Please see the ClibPDF section for details. Note that ClibPDF has a slightly different API than PDFlib.

The bounding box is calculated using information available from character metrics, and unfortunately tends to differ slightly from the results achieved by actually rasterizing the text. If the angle is 0 degrees, you can expect the text to need 1 pixel more to every direction.