Dependency Injection in PHP | Create a Service Container from Scratch | Use PHP-DI

Learn what dependency injection is, and how to do it in PHP.

Topics covered:
• Dependency injection
• Service containers
• Autowiring
• Third-party DI containers like PHP-DI

All source code shown is free to download:

Links shown in the video:

Videos:
‣ Securely Storing PHP Configuration Settings

Image used in thumbnail:

00:00 Introduction
00:22 What is dependency injection?
03:46 Create a DI container
05:27 Autowiring
11:00 Defining services
13:52 Use PHP-DI
15:48 Summary

#PHP #dependencyinjection #laravel #symfony

[danimatuko]

The way you explain such complicated topics is amazing 👏🏾

[someutubchannel]

Great Teacher!
I have 4 Udemy courses from him!
He Masters PHP! 😎👍

[yhaouatis]

Absolutely perfect! Thank you so much for helping me truly grasp DI in the right way.

[AndrewKwabula]

At Uni I chose to do a Developmental project and it was building a web service for an MSc course. I enrolled in Dave's API course on Udemy. The webs service was being consumed by Embassy websites. I tried several courses on Udemy and other sites only Dave's API course was helpful. It was also the shortest yet it covered everything I needed including detailed JWT Authentication. Dave's understanding of PHP is amazing, I guess he now dreams in PHP.

[awabomer]

This is the best 👌, never heard anything better. I guess people are the reason why everything sounds very complicated.

[edopenroz]

This was great and amazingly well explained. I previously didn't understood so much the idea behind dependency injection, but with this video is much more clear now. Thanks again Dave!

[iam.masoudsamimi]

The PHP 🧙‍♂ wizard as always to the point with simple explanations. Loved it. Thank you.

[Nomad-mfpn]

This is exactly what I've been struggling with to understand, thank you so much. Great explanation.

[dannymason]

Excellent instructor and clearly very competent on the subject matter.
Please consider a course on using/accessing.a PHP application with SSO/Entra.

[brunoggdev]

What a great video. such way to explain the topic, amazing job

[Paretozen]

Absolutely well done! Start with the most basic, then roll into an actual framework. I guess this shows the power of the prs-11 convention?

[shashikantmarskole]

thank you for create quality content and way you explain. keep it up

[awabomer]

Lots of very good content on your channel, i also checked the paid courses and will buy them, but i couldn't find any course on how to develop a multi env app like "staging" and "prod", "testing" i think this should be the next topic

[jediampm]

HI, the simplest and best explanation. Thanks.
Now is missing a video about php as template system like plates, how organize using section / blocks or template Inheritance and base layouts.
Please update your PHP unit course, which i already bought, to v10.
And if possible, do first a video (overview) about Pest lib for testing and later on a full course on udemy. Thanks.

[NedumEze]

Thank you Dave. That was magnificent. I wish that your words during your presentation are captured as comments for each line.

May I ask? The way you structured your psr-4 autoload setting: "": "sec/", will it still work if your Classes had namespaces?

[ArsNoble]

Am understanding it but its challenging to find utility in my projects.
Am thinking i should learn a bit bout Design pattern first like factory, singleton etc .

[alalyrealestate]

Thank you Dave for all your tutorials. Do you have or plan for a Laravel tutorial?
Are there any new full tutorial coming? and thanks again

[Alleo-zlfp]

hi @dave may i know what Text editor you are using ??

[ll]

Hello Dave,
I am still getting the Error: Uncaught ReflectionException: Class "string" does not exist.
But then I realizing that my DAO class has a parameter with type PDO instead of the Database object, after I change the parameter type to database class object, it worked.
But in cases like this where we just need to pass a method (returns the connection object) in the constructor is there a way to handle this with DI container? or is that even a good practice?

[tariksadiku]

Hi, I wanted to ask a question, how do I resolve classes through DI that need runtime parameters?

For example, if I have a UserService that in it's constructor will accept a User Model (say a User in Laravel), how do I inject this UserService as a dependency?
I was thinking maybe I can have a setter injection instead of a constructor so that wherever I inject the class as a dependency itself, I call it's setter method to set the User for that UserService and then go through the logic I need to go through, is this a smart idea?