Where to put certain code

[eluser]Mossab Alzeeny[/eluser]
[quote author="jaswinder_rana" date="1229209507"]Hi:

I have just downloaded CodeIgniter. I am not sure about where to place certain code.
well, Welcome to CI world,
useally your php code will be in the controller (never use html codes there, put all htmls in the view file

I have started my own application. My first part is to build authentication system. I have the tables and logic planned out. I have already done many authentication system but I wanted to do it with CodeIgniter this time.

I have few questions:

- Where do I place code for login
- Where do I place code for checking login for users
hmmm what you think if you take a look at the DX_auth library ? it's totally AMAZING, and as the author says, it's Very well documented,

Some different topics are:
- If I have a header view, do I need to include it in every Controller? Or is there a way to automatically include it in every controller?
yes, you will have to include the view file everytime in your Controllers

- If I have sidebars, and some content might be page specific and some application wide. What is the best way to deal with them? Call Models in every controller?
yeah i think, or maybe i didn't get the question..

As you can see, it's overwhelmed me a little.

I know (and am reading) CodeIgniter manual. But, are there some sample applications, say a sample blog system or something, that I can look at and see how they do things?
ofc CI Tutorials

Oh and totally off topic question, is there plan to write PHP5 only CodeIgniter?
no idea, i hope NO, there still some ppl loves PHP4[/quote]