Required input is not working?

I have this input but its not working because i have in name []. Any suggestion how can i fix this? If i remove this [] required is working.

    @foreach ($languages as $language)
          <input type="text" id="text-title" name="article_title[]" value="" class="form_input" required="required">
    @endforeach

 <button type="submit" class="submit_property bg_green pull-right">CREATE ARTICLE</button>

validation rules:

 public function rules()
    {
        return [
            'article_title'                 => 'required:articles',
            'slug'                          => 'required|unique:articles',
    }

Problem is that i need required rule only if $language->id = 1

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