A other class, which is maybe better I will introduce here (http://www.fpdf.org/) (reinerj)?
What is FPDF?
FPDF is a PHP class which allows to generate PDF files with straight PHP, that is to say without using the PDFlib library. The advantage is that PDFlib requires a fee for a commercial usage. F from FPDF stands for Free: you may use it for any kind of usage and modify it to suit your needs.

FPDF has other advantages: high level functions. Here is a list of its main features:

* Choice of measure unit, page format and margins
* Page header and footer management
* Automatic page break
* Automatic line break and text justification
* Image support (JPEG and PNG)
* Colors
* Links
* TrueType?, Type1 and encoding support
* Page compression

FPDF requires no extension (except Zlib to activate compression) and works with PHP4 (versions before 1.4 work with PHP3 too).

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the ROS pdf class ( http://ros.co.nz/pdf/ )
There is very good documentation availlable at http://ros.co.nz/pdf/
to make it a part of the API:

• copy the file class.pdf.inc.php and directory pdf from property/inc to phpgwapi/inc
• class.pdf.inc.php has to be edited : replace PHPGW_APP_INC with PHPGW_API_INC

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Nicola Asuni:

Instead of FPDF or ROS, I strongly suggest to implement TCPDF.

http://sourceforge.net/projects/tcpdf
http://tcpdf.sourceforge.net

TCPDF is an Open Source PHP class for generating PDF files on-the-fly without requiring external extensions.
TCPDF is an extension and improvement of the FPDF class by Olivier Plathey.

TCPDF is already used by a large number of PHP projects such as phpMyAdmin (from 2.10), Drupal, Joomla, AIOCP, TCExam, etc.

TCPDF Main Features:

• supports all ISO page formats;
• supports UTF-8 Unicode;
• includes methods to publish some XHTML code;
• includes a method to print various barcode formats;
• supports TrueTypeUnicode?, TrueType?, Type1 and encoding;
• supports custom page formats, margins and units of measure;
• includes methods for page header and footer management;
• supports automatic page break;
• supports automatic page numbering;
• supports automatic line break and text justification;
• supports JPEG and PNG images;
• supports colors;
• supports links;
• support page compression;
• the source code is full documented;