In Laravel: when storing a new point, I didn't want it to be too close to another or have the same name in the same city. Proximity and distance use Haversine Formula.

PointController.php

<?php


    /**
     * Store a newly created resource in storage.
     *
     * @param  Request  $request
     * @return Response
     */
    public function store(PointCreateRequest $request)
    {

        $proximity = Point::centeredAt($request->lat, $request->lng, 0.0001);
        if ($proximity->count() > 0){
            $point = $proximity->first();
            return redirect('create')
                ->withErrors(['There is already a point at that location: <a href="'.$point->getUrl().'">'.$point->name.'</a>.'])
                ->withInput();
        }

        $named = Point::where('city', $request->city)->where('name', $request->name);
        if ($named->count() > 0){
            $point = $named->first();
            return redirect('create')
                ->withErrors(['There is already a <a href="'.$point->getUrl().'">'.$point->name.'</a> in '.$point->city])
                ->withInput();
        }

        $point = new Point();

        DB::transaction(function() use ($request, $point){

            foreach($this->fillable as $key){
                $point->$key = $request->input($key);
            }

            $point->save();

            if ($request->has('tags')){
                foreach(explode(",", $request->get('tags')) as $tag){
                    $tag = Tag::firstOrCreate(['name' => $tag]);
                    $point->tags()->attach($tag);
                }
            }

        });