Assistance with if..elseif statement

[Craig Hoffman <choffman@xxxxxxxxxx>]

I have this block of code which checks to see if an image has been 
uploaded from an update form.  Everything in the form works,  except I 
can not get the the elseif statements to behave properly. See the 
comments below for explanation.  Any help would be appreciated.

$route_photo = $_FILES['image']['name'];

// if no new image and no existing image put NULL in the DB
 if(empty($_FILES['image']['name']) && ($_POST['oldimage']) == '')
        {
            $route_photo = 'NULL';
             echo ("No image supplied.");

 // if new image put the new image name in the DB
        }  elseif ($_POST['route_photo'] || $_FILES['image']['name']) {
              $route_photo = $_POST['route_photo'];
                 echo ("The image has been replaced with 
$route_photo.");

// If no new image update, use the old image
        }  elseif ($_POST['route_photo'] = $_POST['oldimage'])
                    {
                     $route_photo = $_POST['oldimage'];
                        echo("No new image supplied");
                    }

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