Lloric Mayuga Garcia lloricode

Laravel's Dependency Injection Container in Depth

Translations: Korean (by Yongwoo Lee)

Laravel has a powerful Inversion of Control (IoC) / Dependency Injection (DI) Container. Unfortunately the official documentation doesn't cover all of the available functionality, so I decided to experiment with it and document it for myself. The following is based on Laravel 5.4.26 - other versions may vary.

Introduction to Dependency Injection

I won't attempt to explain the principles behind DI / IoC here - if you're not familiar with them you might want to read What is Dependency Injection? by Fabien Potencier (creator of the Symfony framework).

Understanding Facades in Laravel

What's a Facade?

The Laravel explination, shown below is confusing.

Facades provide a "static" interface to classes that are available in the application's service container. Laravel ships with many facades which provide access to almost all of Laravel's features. Laravel facades serve as "static proxies" to underlying classes in the service container, providing the benefit of a terse, expressive syntax while maintaining more testability and flexibility than traditional static methods.

Many examples use Cache::get('key') to demonstrate how a Facade works. Comparing the following code to the utility that a Facade provides.

Use curl to get the JSON response for the latest release
Use grep to find the line containing file URL
Use cut and tr to extract the URL
Use wget to download it

curl -s https://api.github.com/repos/jgm/pandoc/releases/latest \
| grep "browser_download_url.*deb" \
| cut -d : -f 2,3 \
| tr -d \" \

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

	<?php namespace App\Providers;

	use Illuminate\Support\ServiceProvider;

	/**
	* If the incoming request is an OPTIONS request
	* we will register a handler for the requested route
	*/
	class CatchAllOptionsRequestsProvider extends ServiceProvider {

	# Best if added to `after.sh` so that this gets run every time the box is provisioned

	# composer won't be able to download updates with an active proxy, and will hang trying to get the newest file
	# You may want to comment this out based on your network configuration
	sudo bash -c 'echo "export NO_PROXY=*" >> ~/.profile'

	sudo add-apt-repository ppa:ondrej/php -y
	sudo apt-get update
	sudo apt-get install php7.2-dev php7.2-xml mcrypt php-pear php-mbstring unixodbc unixodbc-dev -y --allow-unauthenticated

	#!/bin/bash
	# SQL Server Driver Installer for Laravel Homestead
	#
	# This script downloads, compiles, and installs the PHP 7 extension
	# files for both the native sqlsrv and the PDO pdo_sqlsrv drivers.

	# Get the Microsoft Driver Source Code from Github
	cd ~
	git clone https://github.com/Microsoft/msphpsql.git
	cd msphpsql

	private function findNearestLocation(Request $request)
	{
	$location = DB::table('locations')
	->select('name', 'latitude', 'longitude', 'region', DB::raw(sprintf(
	'(6371 * acos(cos(radians(%1$.7f)) * cos(radians(latitude)) * cos(radians(longitude) - radians(%2$.7f)) + sin(radians(%1$.7f)) * sin(radians(latitude)))) AS distance',
	$request->input('latitude'),
	$request->input('longitude')
	)))
	->having('distance', '<', 50)
	->orderBy('distance', 'asc')

	<?php

	namespace Tests;

	use Illuminate\Contracts\Auth\Authenticatable;
	use Illuminate\Foundation\Http\FormRequest;
	use Illuminate\Validation\ValidationException;
	use Illuminate\Validation\Validator;
	use Symfony\Component\HttpFoundation\ParameterBag;
	use function PHPUnit\Framework\assertFalse;

	<?php

	namespace App\Providers;

	use App\Encrypter;
	use Illuminate\Support\Str;
	use Illuminate\Support\ServiceProvider;

	class AppServiceProvider extends ServiceProvider
	{