I have a problem related to BACK button in browsers.

In very first page my basket shows "0 item". I go to next page to add one item to basket and it shows "1 item" in current page. If I hit BACK button in browser to go back to very first page again, the basket shows "0 item" although the basket has actually "1 item" in it. So, how do I solve this problem? Is it related to cache or refreshing etc. I read a bit about caching but I lost myself in it also not sure it is to do with it anyway.

Thanks for advance

If you hit F5, your page will get the latest details. Generally, this behavior is what you want and you shouldn't mess with this - in my opinion. Especially if your site is visited by users that pay for data (such as phone users) you want the back button to not cause a refresh.

I know F5 but I wonder if I have to put extra code to read everything from zero.

You can, but I recommend you not to. The expected result of the back button is bringing the browser back to a previous state, not reloading the last visited page.

There we go. I worked out. I hope it helps others as well.

public function stop_caching()
  // These will stop caching otherwise "Back" button on browsers will display unupdated content
  //** CI Style
  $this->output->set_header("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
  $this->output->set_header("Pragma: no-cache"); 
  //** PHP Style
  //header("Cache-Control: no-cache, no-store, must-revalidate, post-check=0, pre-check=0");
  //header("Pragma: no-cache");
  //** HTML Style
  //<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate, post-check=0, pre-check=0" />
  //<meta http-equiv="Pragma" content="no-cache" />