[PHP] mcrypt pdflib configuration

I've already posted this question in comp.lang.php but no one seemed to have an answer to it. So I've got PHP to recognize mcrypt and pdflib in the phpinfo() output, but trying to use any of the functions fail with ...undefined function called... There aren't any configurable files with either

[PHP] Code help

I am fairly new to the PHP language and have built a website with it before, but nothing very complicated. Is there anyway of grabbing information from the browser as to where a user may have come from (referring page, search engine, etc.)? And if so, how would I go about getting it? William