Output checkboxes with appropriate 'checked' attributes in Laravel

routes.php

Route::get('edit', function() {
    // fetch our post, and it's associated categories
    $post = Post::with('cats')->where('id', '=', $id)->first();

    // fetch all of our categories
    $cats = Cat::all();

    // create our empty array
    $post_cats = array();

    // loop through each post category, and add the id to our array
    foreach ($post->cats as $cat) {
        $post_cats[] = $cat->id;
    }

    return View::make('edit'))->with('post', $post)
                              ->with('cats', $cat)
                              ->with('posts_cats', $posts_cats);
});

views-edit.php

<p>Categories</p>
<ul>
@foreach($cats as $cat)
    <li>{{ Form::checkbox('cats[]', $cat->id, in_array($cat->id, $post_cats)) }} {{ Form::label('cats_'.$cat->id, $cat->title) }}</li>
@endforeach
</ul>

plz some one help me how to edit post with multiple categories in edit page. how to get selected categories to select show on edit page. how to retrieve.
result with checkbox