I have a form for a user register in a conference. But when the user clicks in "Store Registration" it shows an undefined offset error and the issue should be because I'm not organizing correctly this context. The form to register in a conference is different depending on if the "all_participants" column of the conferences table is "1" or "0".

If all_participants is 1 in the conferences table

If the conferences table has the column "all_participants" with value "1" that means that is necessary to collect the name and surname of each participant (about each selected registration type). So the form will show form fields to collect the name and surname of each participant. Also if some of the selected registration type(s) have custom questions associated is necessary to collect the answers to that questions for each participant if "all_participants" is 1. In the image above the registration type "General" has a custom question associated "Phone", so its necessary to collect the answers of the two participants there are being registered with the registration type "General".

Image that shows the form of all_participants as "1" in the conferences table

After the user click in "Store Registration" it should be stored in the tables like below:

If all_participants is 0 in the conferences table

If "all_participants" is "0" the form would have only one field "Phone" because the name and surname are got directly from the authenticated user info. And because "all_participants" is "0" is only necessary also to collect the phone of the user that is doing the registration (the authenticated user), for the other participants is not necessary because "all_participants" is "0". So the form if "all_participants" is "0" would have only one field (Phone) in this case. And the participants table is only necessary to store the name and surname of the user that did the registration, for the other participants can be stored empty "".

Form if all_participants is "0":

After the user click in "Store Registration" it should be stored in the tables like below:

HTML of this image context for the case of "all_participants" is 1:

<form method="post" id="registration_form" action="http://proj.test/conference/1/conference-title/registration/storeRegistration">

  <h6>Participant - 1 - general</h6>
  <div class="form-group">
    <label for="namegeneral_1">Name</label>
    <input type="text" id="namegeneral_1" name="participant_name[]" required="" class="form-control" value="">
  </div>

  <div class="form-group">
    <label for="surnamegeneral_1">Surname</label>
    <input type="text" id="surnamegeneral_1" required="" class="form-control" name="participant_surname[]" value="">
  </div>

  <div class="form-group">
    <label for="participant_question">Phone?</label>
    <input type="text" name="participant_question[]" class="form-control" required="">
    <input type="hidden" name="participant_question_required[]" value="1">
    <input type="hidden" value="1" name="participant_question_id[]">
  </div>

  <input type="hidden" name="rtypes[]" value="1">

  <h6> Participant - 2 - general</h6>

  <div class="form-group">
    <label for="namegeneral_2">Name</label>
    <input type="text" id="namegeneral_2" name="participant_name[]" required="" class="form-control" value="">
  </div>

  <div class="form-group">
    <label for="surnamegeneral_2">Surname</label>
    <input type="text" id="surnamegeneral_2" required="" class="form-control" name="participant_surname[]" value="">
  </div>

  <div class="form-group">
    <label for="participant_question">Phone?</label>
    <input type="text" name="participant_question[]" class="form-control" required="">
    <input type="hidden" name="participant_question_required[]" value="1">
    <input type="hidden" value="1" name="participant_question_id[]">
  </div>

  <input type="hidden" name="rtypes[]" value="1">

  <h6> Participant - 1 - plus</h6>

  <div class="form-group font-size-sm">
    <label for="nameplus_1">Name</label>
    <input type="text" id="nameplus_1" name="participant_name[]" required="" class="form-control" value="">
  </div>

  <div class="form-group font-size-sm">
    <label for="surnameplus_1">Surname</label>
    <input type="text" id="surnameplus_1" required="" class="form-control" name="participant_surname[]" value="">
  </div>

  <input type="hidden" name="rtypes[]" value="2">

  <input type="submit" class="btn btn-primary" value="Store Registration">
</form>

When user clicks in "Store Registration" the code goes to the StoreRegistration() to store all the registration info in database:

public function storeRegistration(Request $request, $id, $slug = null)
  {
      $allParticipants = Conference::where('id', $id)->first()->all_participants;
      $user = Auth::user();

      $rules = [];
      $messages = [];

      if ($allParticipants == 1) {

          $rules["participant_name.*"] = 'required|max:255|string';
          $rules["participant_surname.*"] = 'required|max:255|string';
      }

      $validator = Validator::make($request->all(), $rules);

      if ($validator->passes()) {

          $total = Session::get('total');

          $registration = Registration::create([
              'conferenec_id' => $id,
              'main_participant_id' => $user->id,
              'status' => ($total > 0) ? 'I' : 'C',
          ]);

          $participants = [];

          for ($i = 0; $i < count($request->participant_name); $i++) {
              $name = ($allParticipants) ? $request->participant_name[$i] : '';
              $surname = ($allParticipants) ? $request->participant_surname[$i] : '';
              $participants[] = Participant::create([
                  'name' => $name,
                  'surname' => $surname,
                  'registration_id' => $registration->id,
                  'registration_type_id' => $request->rtypes[$i]

              ]);
          }

          if (isset($request->participant_question)) {
              foreach( $request->participant_question as $key => $question ) {
                  $answer = Answer::create([
                      'question_id' => $request->participant_question_id[$key],
                      'participant_id' => $participants[$key]->id, // undefined index error is here
                      'answer' => $request->participant_question[$key],
                  ]);
              }
          }
          return redirect(route('user.index', ['user' => Auth::id()]).'#myTickets');
      }
      else{
          dd($validator->errors());
      }
  }

I have the Question model that has the getHtmlInput() to generate the HTML for the custom questions and add the required attribute to the field if the "required" column in pivot table "registration_type_questions" is "1":

class Question extends Model
{
    protected $fillable = [
        'question', 'type', 'conference_id',
    ];
    public static $typeHasOptions = [
        'radio_btn',
        'select_menu',
        'checkbox'
    ];
    public function registration_type()
    {
        return $this->belongsToMany('App\RegistrationType', 'registration_type_questions')
            ->withPivot('required');
    }
    public function options()
    {
        return $this->hasMany('App\QuestionOption');
    }
    public function hasOptions()
    {
        return in_array($this->type, self::$typeHasOptions);
    }
    public function getHtmlInput($name = "", $options = "", $required = false, $customtype = false)
    {
        $html = '';
        $html .= $customtype == 'checkbox' ? "<div class='checkbox-group ".($required ? " required" : "")."'>" : '';
        $html .= $customtype == 'select_menu' ? "<select name='participant_question[]' class='form-control' " . ($required ? " required" : "")
            . ">" : '';

        if (empty($options)) {
            switch ($customtype) {
                case "text":

                    $html .= " 
                <input type='text' name='participant_question[]' class='form-control'" . ($required ? " required" : "")
                        . ">";
                    break;

                case "file":
                    $html .= " 
                <input type='file' name='participant_question[]' class='form-control'" . ($required ? " required" : "") . ">";
                    break;

                case "long_text":
                    $html .= "
            <textarea name='participant_question' class='form-control' rows='3'" . ($required ? " required" : "") . ">"
                        . $name .
                        "</textarea>";
                    break;
            }
        } else {
            foreach ($options as $option) {
                switch ($customtype) {
                    case "checkbox":
                        $html .= " 
        <div class='form-check'>
            <input type='checkbox' name='participant_question[]' value='" . $option->value . "' class='form-check-input' >
                <label class='form-check-label' for='exampleCheck1'>" . $option->value . "</label>
        </div>";
                        break;
                    case "radio_btn":
                        $html .= " 
            <div class='form-check'>
                <input type='radio' name='participant_question[]' value='" . $option->value . "' class='form-check-input'" . ($required ? " required" : "") . ">" .
                            '    <label class="form-check-label" for="exampleCheck1">' . $option->value . '</label>' .
                            "</div>";
                        break;
                    case "select_menu":
                        $html .= "<option value='" . $option->value . "'>" . $option->value . "</option>";
                        break;
                }
            }
        }
        $html .= $customtype == 'select_menu' ? "</select>" : '';
        $html .= $customtype == 'checkbox' ? "</div>" : '';

        return $html;
    }
}

Then in the view the getHtmlInput() is used like:

@foreach($selectedRtype['questions'] as $customQuestion)
  <div class="form-group">
      <label for="participant_question">{{$customQuestion->question}}</label>
      @if($customQuestion->hasOptions() && in_array($customQuestion->type, ['checkbox', 'radio_btn', 'select_menu']))
          {!! $customQuestion->getHtmlInput(
              $customQuestion->name,
              $customQuestion->options,
              ($customQuestion->pivot->required == '1'),
              $customQuestion->type)
          !!}

      @else
          {!! $customQuestion->getHtmlInput(
              $customQuestion->name,
              [],
              ($customQuestion->pivot->required == '1'),
              $customQuestion->type)
          !!}
      @endif
      <input type="hidden"
             name="participant_question_required[]"
             value="{{ $customQuestion->pivot->required }}">
      <input type="hidden"
             value="{{ $customQuestion->id }}"
             name="participant_question_id[]"/>
  </div>
@endforeach

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