如何使用一个变量重定向'；s已存储为数组

我有以下代码：

public function searchgrouppost(){
         $subject1 = Input::get('subject1');
         $subject2 = Input::get('subject2');
         $subject3 = Input::get('subject3');
         $subject4 = Input::get('subject4');
         $subject5 = Input::get('subject5');
         $subject6 = Input::get('subject6');
         $subject7 = Input::get('subject7');
//collects by variables and stores them in an array                              
$subjects = [];
$inputs = Input::all();
array_walk($inputs, function ($v, $k) use (&$subjects) {
  if(starts_with($k, 'subject')) {
    $subjects[$k] = $v;
   }
});
  //counts the number of subjects that are chosen    
 $index = count($subjects);

if  ($index == 1){
 //the code below is wrong because if i click on any 
 //other subject other than subject1 I get an error. 
return Redirect::route('home', array('subject1' => $subject1, 'subject2' =>
 $subject2, 'subject3' => $subject3, 'subject4' => $subject4,
'subject5' => $subject5, 'subject6' => $subject6, 'subject7' => $subject7));  
//if the user chooses two subjects
elseif ($index == 2){
//code below is wrong 
return Redirect::route('hometwo', array('subject1' => $subject1,
'subject2'   => $subject2, 'subject3' => $subject3, 
'subject4' =>  $subject4,'subject5' => $subject5, 'subject6' => $subject6,
 'subject7' => $subject7));  
} 

我正在尝试将用户重定向到合适的url，我可以这样做，但我如何传递变量，以便在另一个页面上使用该值？

我不能通过$subjects，因为它是一个数组。

如果用户选择一个主题，我的路线代码如下：

Route::get('/home/{subject}', array( 'as' => 'home', 
'uses' => 'GroupSubjectController@home'));