I expect I am not the only one to face this problem, but the other cases I found dealt with a missing font directory. In my case I checked that there is a helveticab font in the c:\xampp\php\pear\fpdf\font directory
But php is searching in another directory, because I get an error message as such:
Failed opening 'helveticab.php' for inclusion (include_path='.;C:\xampp\php\PEAR')
Thus I understand that the include path for fonts is not well initialized. The problem is that I did not find where it is initialized. Does anyone knows where it is? Or maybe I am wrong and the solution is not there ?