$allow_state_array_invoc = array('store_invoice','invoiceno','invoicerec','invoiceing');

         if (in_array($_GET['state'],$allow_state_array_invoc)) {

              $condition['invoice_state']  = str_replace($allow_state_array_invoc,

              array('0','1','2','3'), $_GET['state']);

         }

         else{

         $_GET['state'] = 'store_invoice';

         $condition['invoice_state'] = 0 ;

         }