What is Dependency Injection in PHP With ExampleWhat is Dependency Injection in PHP With Example


If you are also curious and think too much about Dependency Injection in PHP, we can learn about PHP Dependency Injection in our layman’s language.

In Dependency Injection, both are common words with known meanings. Dependency means something is dependent on another thing and if we complete that dependency with the help of a useful parameter that is called injection.

What is Dependency Injection in PHP With Example

Dependency Injection in PHP With Example

Now, In PHP Dependency Injection is a software approach where we avoided using hard-coded data in our program. In this approach, one object supplies the dependencies to another object.

Also in Dependency Injection, it can change the dependencies value at runtime and as well as compile-time of the execution.

Check the below example to better understand the Dependency Injection,


Output: 3

Code Explanation

  1. First, we create a class named Programmer where we create a private variable and one of the parameterized constructor functions to take the values when the object is created.
  2. Now we create a function that counts the total values which we pass at the time of object creation.
  3. At last, we create an array with some values.
  4. Then we create an object of the class and set the array variable as an argument.
  5. Now we call the function which gets the count of an array of elements.

The above example is also called Constructor Injection.

Also Read: Bootstrap Datepicker- Complete Solution to Integrate

Some Major Benefits of Dependency Injection

  • Dependency injection is used when we want to inject dependencies at runtime and compile time.
  • Adding dependencies is as easy as a setter method that does not interfere with existing code.
  • By using Dependency Injection we can reduce hard code values on our program.


In this article, we discuss Dependency Injection with an example. Also, I provide a complete explanation of the given example step by step.

Here you can check the layman’s meaning of Dependency Injection and the definition according to PHP programming concepts.

To know more about PHP OOP you can check the official guide PHP: Classes and Objects – Manual.

Also Read: How to Execute PHP File From Command Line

Happy Coding..!

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By Bikash

My name is Bikash Kr. Panda. I own and operate PHPCODER.TECH. I am a web Programmer by profession and working on more than 50 projects to date. Currently I am working on the web-based project and all the CMS and frameworks which are based on PHP.

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