On null input "implode(): Invalid arguments passed" in laravel

Question

I am using laravel 5.5 I have a multi-select dropdown. if I don't select any value it generates an error. "implode(): Invalid arguments passed"

<select  multiple="multiple" name="language[]">
@foreach($language_data as $language)
   <option value="{{$language->language_id}}">{{$language->language_name}}</option>
@endforeach
</select>

Controller

  $language = $request->input('language');
  $language = implode(',', $language);
 DB::table('language')->insert(['language' => $language,]);

Answer 1

just use a simple if:

if($request->input('language') !== ''){
  $language = $request->input('language');
  $language = implode(',', $language);
 DB::table('language')->insert(['language' => $language,]);
}

And you can have a fall back if needed to define a language in the backend if none is selected like below

$request->input('language') !== '' ? $language = $request->input('language') : $language = 'en_GB';

$language = implode(',', $language);
DB::table('language')->insert(['language' => $language,]);