I just want to know if where can we get 7days tourist china visa or atleast 1 mo.?

Hi everyone. I just want to know if where can we get 7days tourist china visa or atleast 1 mo.?Do you know an agency here in shenzhen who can do that?My friends want to visit me here but i don't know what should they do?Please help. My friends will come from philippines going to Macau then China. Please email me at gmail.com|mercy1986