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Can you be more specific about what functions you are trying to use. Sage supports most of symbolic calculus necessary for what I do. As far as interface with a website is concerned, I have done it using cgi, but should be possible with php also. Have a look at this

http://ask.sagemath.org/question/1166/implementing-sage-on-website

I would not recommend using the eval command as it is a security problem. But, you can import sage in python as a module. So you can write a cgi script in python and import sage. This is something I was able to do in a very short time. If you spend more time I am sure you can do better.