how to dynamically option the selected in html just using php?

I'm trying to dynamically the select option selected just using php in laravel but I'm getting this error:

Use of undefined constant selected - assumed 'selected' (this will throw an Error in a future version of PHP) (View: C:\xampp\htdocs\laralast\resources\views\view.blade.php)

below is my view blade

<select class="form-control" name="assign_to" id="assign_to">
    <option selected disabled>Select support</option>
    @foreach($supports as $support)
    <option value="" ></option>
    @endforeach
</select>

Can you help me with this.

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