Converting doc, docx, pdf to HTML using PHP linux

i run a job search site, and i need to convert doc, docx and pdf files into HTML on linux CentOS server running php. People submit these files as resumes. So far, I found PHPDocx to be great at converting docx to html. But I am stuck at doc/pdf. PDFTOHTML gives error "bad color" when i run tests. As far as doc, i only found wvwave, which seems complex and bulky to install.

does anyone have any ideas on how to easily convert doc/pdf to HTML?