title: how to define Global variable in codeigniter?
body: <p>I have a condition for price filtering products in codeigniter...</p>
  
  <p>When user clicks on filter button, lower &amp; higher value as well as that category id of that page is sent to controller...</p>
  
  <p>Now, when user is on that page and clicks on another next page (In pagination).. those all values are gone... how can i set them globally so that even when user goes for next page those lower,higher value and category ids i can use again...</p>
  
  <p>I am using codeigniter's pagination library...</p>