Dependency injection in Laravel

Question

Coming for a JavaScript and Java background, I find dependency injection in Laravel (or PHP) extremely confusing.

For example (Laravel 5.1), in Middleware/Authenticate the constructor takes a Guard object. I have search the codebase and the class Authenticate is never instantiated.

So where is the Guard coming from then?

Thanks, SK.

Much of Laravels work in done using reflection: php.net/manual/en/intro.reflection.php and php's magic methods: php.net/manual/en/language.oop5.magic.php. You won't necessarily find objects being directly instantiated. — craig_h
– craig_h, Commented Oct 25, 2015 at 11:11

fico7489 · Accepted Answer · 2015-10-25 11:13:13Z

1

Look at the laravel documentation:

Dependency injection is a fancy phrase that essentially means this: class dependencies are "injected" into the class via the constructor or, in some cases, "setter" methods. http://laravel.com/docs/5.1/container

You can instantiate Guard in your code or fetch instance of Guard from somewere and pass it to Middleware/Authenticate constructor.

EDITED : Guard is injected into the Middleware/Authenticate automatically somewere in laravel framework code at some point. You better take a look on different example of Dependency injection in Laravel where all is visibly in your code.

edited Oct 25, 2015 at 11:13

answered Oct 25, 2015 at 10:56

fico7489

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2 Comments

skay- Over a year ago

Yes I have read that and I have used 'dependency injection' in JavaScript. My question is how Guard is injected into the Middleware/Authenticate automatically.

POV Over a year ago

Where is being DI in Laravel, I mean creation of instance class of injectable object?

Ritesh Chitrakar · Accepted Answer · 2019-06-22 06:20:05Z

0

Defn : Dependency injection is a technique whereby one object supplies the dependencies of another object.

You could visit the link below for a detailed explanation with ioc container explanation Visit : https://www.thelearninguy.com/dependency-injection-in-laravel-using-ioc-container

answered Jun 22, 2019 at 6:20

Ritesh Chitrakar

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