Pagination - Get limit and offset

gistfile1.php

function page($page,$limit){
    if($page == 0 ){
        return 0;
    }elseif ($page == 1){
        return $limit;
    }else{
        if($limit == 1){
            return $page * $limit;
        }else{
            return ($page * $limit) - $limit;    
        }        
    }
}