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What is dependency injection in PHP?
Dependency injection is a procedure where one object supplies the dependencies of another object. Dependency Injection is a software design approach that allows avoiding hard-coding dependencies and makes it possible to change the dependencies both at runtime and compile time.
There are numerous approaches to inject objects, here are couple generally known −
Constructor Injection
In this approach, we can inject an object through the class constructor.
Example
<?php
class Programmer {
private $skills;
public function __construct($skills){
$this->skills = $skills;
}
public function totalSkills(){
return count($this->skills);
}
}
$createskills = array("PHP", "JQUERY", "AJAX");
$p = new Programmer($createskills);
echo $p->totalSkills();
?>Output
3
Setter Injection
where you inject the object to your class through a setter function.
Example
<?php
class Profile {
private $language;
public function setLanguage($language){
$this->language = $language;
}
}
$profile = new Profile();
$language = array["Hindi","English","French"];
$profile->setLanguage($language);
?>Benefits of Dependency Injection
- Adding a new dependency is as easy as adding a new setter method, which does not interfere with the existing code.
Updated on: 29-Jun-2020
9K+ Views
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