test isadmin字段值

application/admin/controller/SingleSign.php

@@ -38,7 +38,7 @@ class SingleSign {
         $str = $this->getSid();
         $pos = stripos($str,'isadmin|b:') + 10;
 
-        $isa = Session::get('isadmin');
+        $isa = Session::get('isadmin','');
 
         dd($isa);
         $isAdmin = substr($str,$pos,1);