PHP ClamaAV Lib is a PHP extension (written in C) that allows to incorporate virus scanning features in your PHP scripts. It uses the Clam Antivirus API (libclamav) for virus scanning. This extension is under development and are supported functions for file scanning and buffer scanning (see functions reference).
Unable to build from source at the moment against PHP4 or PHP5 and upstream seems to of been dead since Sept-2005.
This doesn't compile here either, apparently way too outdated for current PHP versions. WONTFIX.