some laravel shortcode like a ? and : . please describe [duplicate]

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• How do I use shorthand if / else? 7 answers

I am working on la-ravel project. I have this code.

please explain

what is ? and :

if($request->pre_delivered){
    $grain_sale->undelivered_bushels = ($request->bushels_sold >= $request->pre_delivered ? $request->bushels_sold - $request->pre_delivered : NULl);
    dd($grain_sale->undelivered_bushels);
}

via Bilal Ahmed