CSS to PDF conversion

We have a dynamic PHP page that needs to be converted to PDF through a backend we have built. Basically the process is as follows in the backend a. User uploads images and text through CMS b. Tempalte is populated with the images and text c. User can click on "download PDF" and the template that was populated will need to download in PDF format At the moment we cannot get step 3 to work. This means we have step 1 and 2 down but need a php script that will convert the page to pdf properly. We can get it to convert to pDF but some of the CSS styles are not being carried over. This would be a breeze for someone who has already perhaps developed or worked with HTML to PDF conversions. Any support you need in terms of editing and chaning the template to work we can do. We just need a working php script to convert Please let me know if you have any questions. thanks