This always returns 0 even though the PDF has several embedded fonts.
Im using TET4.1 PHP 5.3 Linux
$fontCount = (integer) $tet->pcos_get_number($doc, "length:fonts");
All other calls using $tet->pcos_get_number($doc, "xxxx") work fine.
without knowing details I can only guess:
I guess in this case, it might be good recommendation to contact the vendor directly. http://www.pdflib.com/licensing-support/opening-a-support-case/