如何修复错误：Laravel中数组到字符串的转换

Question

I have a radio button like this

    <div class="card border-grey border-lighten-3 px-2 py-2 box-shadow-1 mt-1">
        <h4 class="content-header-title">Lesson</h4>
            @foreach($lesson as $key=>$less)
                <div class="form-check">
                    <input type="radio" name="lesson[]" value="{{$key}}"> <label>{{$less}}</label>
                </div>
            @endforeach
    </div>

I have function to save value from radio button, but when i click save it appears error like this

Array to string conversion

Bellow is function to save

    function saveLess(Request $req){
            $post = new Post;
            $post->title        = $req->title;
            $post->content      = $req->content;
            $post->file_video   = $req->video;
            $post->tags         = $req->tags;
            $post->lesson       = $req->input('lesson');
            $post->save(); 
        }

Answer 1

You are passing the radio button name as lesson[] which refers as array() . You have to set the name as lession . Or if you want to pass multiple variables in radio button , Then use any of the following method .

implode() or serialize or json_encode .

If you want to pass only one variable , set ,

<input type="radio" name="lesson" value="{{$key}}">