PHP Programming Tips

Can a php file ( that contains login processing information, such as: username and pass checking) that is on your website be downloaded or script seen? I’m looking into making my own web page cause I can’t find too much help and I notice a lot of the sensitive information is put into php files and Im unsure if thats secure and if not where do you put it?

could someone please code this image map for my myspace?

for security reasons: where the friend id goes please just type in *****friendID*******

thank you!
here is the image.

http://tinypic.com/view.php?pic=2rcmzoz&s=3

THANK YOU IN ADCANCE!

best answer &+ 10 pts to person who codes it!
If you knew what you were talking about before you answerd people.
I wouldnt have to say this:
I did not ask for a layout!
it is that image:
CODED!
so when people click on the image map,
they can cmnt me msg, ect!

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why my dynamic web content cannot be viewed from other computer within LAN? I used PHP,Mysql and apache?

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