DeveloperGuide/step-0-sample-apps/sample-php-app/app/Helpers/AppHelper.php

<?php

namespace App\Helpers;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

use App\Models\User;

class AppHelper
{

	public static function instance()
	{
		return new AppHelper();
	}


	// get user from session or generate a random user
	public function randomUser() {
		$user = session('user');
		if (!$user) {
			// session died, so we need to get a new user
			if ($this->checkDB() && Schema::hasTable('users')) {
				// if there's no database connection, use JSON data
				$user = User::inRandomOrder()->first();
			} else {
				$user = AppHelper::instance()->userJson('rand');
				$user->fromJson = 1;
			}
		}
		session([ 'user' => $user ]);
		return $user;
	}


	// display a cart icon and a floating list of items in the cart
	public function globalCart($show=null) {
		$cart = session('cart');
		$cart_total = 0;
		$cart_data = [];
		if ($cart) {
			$item = AppHelper::instance()->itemJson('items',array_keys($cart));
			foreach($item as $i) {
				$qty = $cart[$i->id];
				$cart_total += $qty;
				$i->qty = $qty;
				$price = is_numeric($i->price) ? $i->price : '0';
				$i->sub = $qty * number_format($price, 2);
				$cart_data[$i->id] = $i;
			}
		}
		$html = view('includes/floating-cart')->with('cart_total',$cart_total)->with('cart_data',($cart_data ?? null))->with('show',$show)->render();
		return ['html'=>$html, 'cart_total'=>$cart_total];
	}


	// use these functions to get json data when there's no database:
	// (don't worry about this section, it's just here to keep the app working if there's no database)

	// checks to see if database is connecting
	public function checkDB()
	{
		try {
			DB::getPdo();
		} catch (\Exception $e) {
			// print($e->getMessage());
			return false;
		}
		return true;
	}

	// returns a user (if ID is provided) or a list of users
	public function userJson($id=null)
	{
		$json = '[ 
			{"id":1,"name":"Jon Yang","address":"3761 N. 14th St","email":"jon24@adventure-works.com","password":"$2y$10$7LnWpy7R7hXgbMnn.IHaSu8i.9E0dTB4tuMVHFm77OwSV46qbIvWa"},
			{"id":2,"name":"Eugene Huang","address":"2243 W St.","email":"eugene10@adventure-works.com","password":"$2y$10$XuvN1ti/OL5mdiPtdd0z6O5b1m0Yft3WHhk3zJphZhr4GrH0OhOzK"},
			{"id":3,"name":"Ruben Torres","address":"5844 Linden Land","email":"ruben35@adventure-works.com","password":"$2y$10$ElCTjmvfndxWb/Z8EpDQkeKFCr0v1N8QSokKzEeXXwwHpPJhPv4EC"},
			{"id":4,"name":"Christy Zhu","address":"1825 Village Pl.","email":"christy12@adventure-works.com","password":"$2y$10$GnIyO51JnABQ2yt/6NCzKOkubSPxq49PST5jWOpfGOhu0emBkNR9e"},
			{"id":5,"name":"Elizabeth Johnson","address":"7553 Harness Circle","email":"elizabeth5@adventure-works.com","password":"$2y$10$ynxB0d5QI/x/s0H.Ks5zIOSlPCT5/LvT2s1EJPsvs1E9SckW3lk8C"},
			{"id":6,"name":"Julio Ruiz","address":"7305 Humphrey Drive","email":"julio1@adventure-works.com","password":"$2y$10$ZeMIoZ9DPVx1Mmb6UldmQOBdpinovkCLtObAvJJr/aoC4ZV9X6RN."},
			{"id":7,"name":"Janet Alvarez","address":"2612 Berry Dr","email":"janet9@adventure-works.com","password":"$2y$10$uyeh/gADnu0PRxhBwfyLT.8sGEL4ndbS0oX8SLg6Ei.eyjE/fffoG"},
			{"id":8,"name":"Marco Mehta","address":"942 Brook Street","email":"marco14@adventure-works.com","password":"$2y$10$CuTmay8q.38uCx67aHmTmu6WCDii0yXq4sP8bEcvilRS2e0puuYRK"},
			{"id":9,"name":"Rob Verhoff","address":"624 Peabody Road","email":"rob4@adventure-works.com","password":"$2y$10$e9/t.fCkYLnzRDDg21tKHef6KWph6Is.NDBcbR8BsN2aeaBQhZ/GK"},
			{"id":10,"name":"Shannon Carlson","address":"3839 Northgate Road","email":"shannon38@adventure-works.com","password":"$2y$10$nEaJMT8ZcuFl5BitQouXXOMyiBVs2OX0MPuHB.wtRyzvpr/64e7J6"}
		]';
		$users = collect(json_decode($json))->sortBy('name')->all();
		if ($id=='rand') {
			$id = rand(1,count($users));
		}
		if ($id) {
			$user = collect(json_decode($json))->where('id', $id)->first();
			return $user;
		} else {
			return $users;
		}
	}

	// returns the list of categories
	public function categoryJson()
	{
		$json = '[ 
			{"id":1,"name":"Breakfast","url":"breakfast","img":"potatoes-g792cf4128_1920.jpg"}, 
			{"id":2,"name":"Steak","url":"steak","img":"tomahawk-ge5ea2413d_1920.jpg"}, 
			{"id":3,"name":"Pizza","url":"pizza","img":"pizza-g204a8b3d6_1920.jpg"},
			{"id":4,"name":"Burgers","url":"burgers","img":"hamburger-g685f013b8_1920.jpg"},
			{"id":5,"name":"Sushi","url":"sushi","img":"food-g3eb975adc_1920.jpg"},
			{"id":6,"name":"Salads","url":"salads","img":"salad-g3f02f56a0_1920.jpg"}
		]';
		$category = collect(json_decode($json))->sortBy('name')->all();
		return $category;
	}

	// returns a list of items
	public function itemJson($type=null,$id=null,$sort='name')
	{
		$json = '[ 
			{"id":1,"category_id":1,"name":"Cinnamon Roll","img":"cinnamon-rolls-gb12ce8577_1920.jpg","price":"1.19","cooktime":"13","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":2,"category_id":1,"name":"Toast & Eggs","img":"breakfast-g7a2675ee6_1920.jpg","price":"2.19","cooktime":"7","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":3,"category_id":1,"name":"Croissant","img":"croissant-ga61b1fb0e_1920.jpg","price":"3.19","cooktime":"2","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":4,"category_id":1,"name":"Bacon & Eggs","img":"eggs-g9c07e92b1_1920.jpg","price":"4.19","cooktime":"14","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":5,"category_id":1,"name":"Pancakes","img":"pancakes-g9d341228a_1920.jpg","price":"5.19","cooktime":"12","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":6,"category_id":1,"name":"Biscuits & Gravy","img":"biscuits-g07bd069f8_1920.jpg","price":"6.19","cooktime":"6","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},

			{"id":7,"category_id":2,"name":"Tomahawk","img":"steak-4342500_1920.jpg","price":"1.29","cooktime":"27","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":8,"category_id":2,"name":"Sirloin","img":"steak-1076665_1920.jpg","price":"2.29","cooktime":"22","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":9,"category_id":2,"name":"T-Bone","img":"steak-978654_1920.jpg","price":"3.29","cooktime":"23","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},

			{"id":10,"category_id":3,"name":"Pepperoni","img":"pizza-1344720_1920.jpg","price":"","cooktime":"12","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":11,"category_id":3,"name":"Margherita","img":"pizza-3000274_1920.jpg","price":"3","cooktime":"6","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},

			{"id":12,"category_id":4,"name":"Sliders","img":"hamburger-494706_1920.jpg","price":"1.49","cooktime":"9","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":13,"category_id":4,"name":"Charbroiled","img":"hamburger-1238246_1920.jpg","price":"2.49","cooktime":"17","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":14,"category_id":4,"name":"Diner Burger","img":"burger-3442227_1920.jpg","price":"3.49","cooktime":"12","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},

			{"id":15,"category_id":5,"name":"Sashimi Fresh Roll","img":"sushi-354628_1920.jpg","price":"1.59","cooktime":"3","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":16,"category_id":5,"name":"Power Fish","img":"sushi-2853382_1920.jpg","price":"2.59","cooktime":"5","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":17,"category_id":5,"name":"Spicy Tuna","img":"sushi-599721_1920.jpg","price":"3.59","cooktime":"7","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":18,"category_id":5,"name":"Avocado Roll","img":"maki-716432_1920.jpg","price":"4.59","cooktime":"2","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":19,"category_id":5,"name":"Sampler Plate","img":"sushi-2856545_1920.jpg","price":"5.59","cooktime":"4","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":20,"category_id":5,"name":"Veggie Roll","img":"sushi-2020287_1920.jpg","price":"6.59","cooktime":"2","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":21,"category_id":5,"name":"Maki","img":"sushi-748139_1920.jpg","price":"7.59","cooktime":"5","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},

			{"id":22,"category_id":6,"name":"Bowl of Lettuce","img":"food-1834645_1920.jpg","price":"1.69","cooktime":"1","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."},
			{"id":23,"category_id":6,"name":"Plate of Lettuce","img":"salad-2150548_1920.jpg","price":"2.69","cooktime":"1","desc":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim lacus vel odio sagittis, ut faucibus felis vulputate. Duis nisi quam, luctus eget augue vel, ullamcorper commodo ipsum. Nunc quam turpis, facilisis interdum vestibulum et, volutpat congue arcu."}
		]';

		// need this to search json by category
		$category_to_id = [];
		$category_list = collect($this->categoryJson());
		foreach($category_list as $c) {
			$category_to_id[ $c->url ] = $c->id;
		}

		if ($type=='byCategory') {
			$item = collect(json_decode($json))->where('category_id', $category_to_id[$id])->sortBy('name')->all();
		} elseif ($type=='item') {
			$item = collect(json_decode($json))->where('id', $id)->first();
		} elseif ($type=='items') {
			$item = collect(json_decode($json))->whereIn('id', $id)->sortBy($sort)->all();
		} else {
			$item = collect(json_decode($json))->sortBy('name')->all();
		}

		return $item;
	}


}