sessions

[eluser]southdevonwebdesign[/eluser]
I have a very confusing sessions problem with my application, I have an admin controller class which loads an orders model, in the order model it sets a variable called sortOrder which holds a SQL field to sort a database table. It also saves this to a session variable called sortOrder, which should be reloaded in the class constructor, however it flat refuses to take a variable as a value, it is however perfectly happy to take text. Am I missing something completely obvious with this?

Code

SortOrder function - saves the current order (doesn't save the session vars)

Code:

function sortOrderResults(){

        if($this->uri->segment(4)!=""){

            switch($this->uri->segment(4)){
                
                case "orderRef":
                    $sort = 'a.orderRef';
                    break;
                case "customerName":
                    $sort = 'b.firstName,b.lastName';
                    break;
                case "dateCreated":
                    $sort = 'a.dateCreated';
                    break;
                case "from_date":
                    $sort = 'a.from_date';
                    break;
                case "to_date":
                    $sort = 'a.to_date';
                    break;
                case "days":
                    $sort = 'a.days';
                    break;
                case "valet":
                    $sort = 'a.valet';
                    break;
                case "verified":
                    $sort = 'a.verified';
                    break;
                case "status":
                    $sort = 'a.status';
                    break;
                case "totalAmount":
                    $sort = 'a.totalAmount';
                    break;              
            }    
            
            if($this->sortResults==$sort){
                if($this->orderResults == 'DESC'){
                    $this->orderResults = 'ASC';
                }
                else{
                    $this->orderResults = 'DESC';
                }
            }
            $this->sortResults = $sort;
        }      

        $this->session->set_userdata('sortResults',$this->sortResults);
        $this->session->set_userdata('orderResults',$this->orderResults);
    }

Class constructor - should read the session variable back in

Code:

var $sortResults = 'a.from_date';
    var $orderResults = 'DESC';    
    
    function Model_order()
    {
        parent::Model();    
        if($this->session->userdata('sortResults'))
            $this->sortResults = $this->session->userdata('sortResults');
        if($this->session->userdata('orderResults'))
            $this->orderResults = $this->session->userdata('orderResults');
    }

This code works

Code:

function sortOrderResults(){

        if($this->uri->segment(4)!=""){

            switch($this->uri->segment(4)){
                
                case "orderRef":
                    $sort = 'a.`orderRef`';
                    $this->session->set_userdata('sortResults','`a.orderRef`');
                    break;
                case "customerName":
                    $sort = 'b.`firstName`,b.`lastName`';
                    $this->session->set_userdata('sortResults','b.`firstName`,b.`lastName`');
                    break;
                case "dateCreated":
                    $sort = 'a.`dateCreated`';
                    $this->session->set_userdata('sortResults','a.`dateCreated`');
                    break;
                case "from_date":
                    $sort = 'a.`from_date`';
                    $this->session->set_userdata('sortResults','a.`from_date`');
                    break;
                case "to_date":
                    $sort = 'a.`to_date`';
                    $this->session->set_userdata('sortResults','a.`to_date`');
                    break;
                case "days":
                    $sort = 'a.`days`';
                    $this->session->set_userdata('sortResults','a.`days`');
                    break;
                case "valet":
                    $sort = 'a.`valet`';
                    $this->session->set_userdata('sortResults','a.`valet`');
                    break;
                case "verified":
                    $sort = 'a.`verified`';
                    $this->session->set_userdata('sortResults','a.`verified`');
                    break;
                case "status":
                    $sort = 'a.`status`';
                    $this->session->set_userdata('sortResults','a.`status`');
                    break;
                case "totalAmount":
                    $sort = 'a.`totalAmount`';
                    $this->session->set_userdata('sortResults','a.`totalAmount`');
                    break;            
            }    
            
            if($this->sortResults==$sort){
                if($this->orderResults == 'DESC'){
                    $this->orderResults = 'ASC';
                    $this->session->set_userdata('orderResults','ASC');
                }
                else{
                    $this->orderResults = 'DESC';
                    $this->session->set_userdata('orderResults','DESC');
                }
            }
            $this->sortResults = $sort;
        }      

        
      
    }