Access to Files on Mobile Phones From Server

[Icarion 0]

Hello all, 

 

What I want  to be able to do is have a user within my app  to upload files into web app  not only from 

their desktop but from their smartphone, tablet  or laptop through an interface using 

a client-less HTML 5 script of some sort? Or any php script? Open source?

 

What I have seen so far is mobile devices accessing files from server but i want to do the reverse.

 

Any help or reference would be appreciated.

 

Thanks

 

Robert