bad ideas

auth.php

<?php
/* SWITCH USER ACCOUNTS */
 public function getChangeAccount($id)
 {
  if(Session::has('old_id'))
  if($id != Session::get('old_id'))
  {
   Session::forget('old_id');
   if(Session::has('old_email'))
    Session::forget('old_email');
  }

   if(! Session::has('old_id'))
   if(Session::has('old_email'))
    Session::forget('old_email');


  if(Session::has('old_email') && strlen(trim(Session::get('old_email'))) > 4 )
  {
   $a = Customers::where('customers_email', Session::get('old_email'))->first();
   $a->checkData();
   $user = User::where('customers_email',Session::get('old_email'))->first();
  }

  if(! isset($user) || (isset($user) && count($user)==0))
  {
   $user = User::find($id);
  }
  if(! isset($user) || (isset($user) && count($user)==0))
  {
   $a = Customers::find($id);
   $a->checkData();
   $user = User::find($id);
  }

  if(! isset($user) || (isset($user) && (is_null($user) || count($user)  == 0)))
   return Redirect::to('/')->with('error', 'Cant find user');

  if(Session::has('old_id'))
  {
   $success = 0;

   if(Session::get('old_id') == $id)
   {
    $success = 1;
   }


   if($success == 1)
   {
    Session::forget('old_id');
    Session::forget('old_email');
    Auth::login($user);
    if(in_array($user->admin, [1,2]))
     return Redirect::to('/admin/customers');

    return Redirect::to('/');
   }

   if($success == 0)
    return returnErrorToClient('Please login.', '/login');

  }

  if(is_null($user) || count($user)  == 0)
  {
   return returnErrorToClient('Please login...', '/login');
  }else
  {

   if(! Session::has('old_id'))
   {
    Session::put('old_id', Auth::id());
    Session::put('old_email', trim(Auth::user()->customers_email));
   }

   Auth::login($user);

   if(in_array($user->admin, [1,2]))
    return Redirect::to('/admin/customers');

   return Redirect::to('/');

  }
 }