Implode a new line in an array in laravel

I'm trying to implode a new line in between my array variables but so far nothing have worked. Does anyone know the solution to my problem? `` public function destroy($id,Request $request) { //decline student $user = User::findOrFail($id);

        $error = array('reason' => 'Reason for rejection:');

        if (isset($request['reason1'])) {

           $reason1= $request->input('reason1');
          $error = array_add($error, 'reason1', $reason1);
           }

       if (isset($request['reason2'])) {

           $reason2= $request->input('reason2');
          $error = array_add($error, 'reason2', $reason2);    
           }

         if (isset($request['reason3'])) {

           $reason3= $request->input('reason3');
          $error = array_add($error, 'reason3', $reason3);
           }

       if (isset($request['reason4'])) {

           $reason4= $request->input('reason4');
          $error = array_add($error, 'reason4', $reason4);    
           }
            if (isset($request['reason5'])) {

           $reason5= $request->input('reason5');
          $error = array_add($error, 'reason5', $reason5);
           }

       if (isset($request['reason6'])) {

           $reason6= $request->input('reason6');
          $error = array_add($error, 'reason6', $reason6);    
           }

            if (isset($request['reason7'])) {

           $reason7= $request->input('reason7');
          $error = array_add($error, 'reason7', $reason7);    
           }

           $error = implode('\n', $error);
    






     if(!$user){

        $request->session()->flash('error','You can not delete this the user');
        return redirect(route('admin.users.index'));

    }
    $url = URL::signedRoute('user.profile' , ['id'=> $id]);
    $updatedata =[

        'body'=> 'Your enrolment application  has been denied',
        'error'=> $error,
        'message'=> 'You are allowed to update your form',
        'url'=> $url,
        'thankyou'=> 'You have 3 days to update your form'

    ];

    
    Notification::send($user, new UpdateForm($updatedata));
   

    $request->session()->flash('success','You have deleted the user');
    return redirect(route('admin.users.index'));

}