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How to call parent constructor in child class in PHP?
We will face two cases while calling the parent constructor method in child class.
Case1
We can't run directly the parent class constructor in child class if the child class defines a constructor. In order to run a parent constructor, a call to parent::__construct() within the child constructor is required.
Example
<?php
class grandpa{
public function __construct(){
echo "I am in Tutorials Point"."
";
}
}
class papa extends grandpa{
public function __construct(){
parent::__construct();
echo "I am not in Tutorials Point";
}
}
$obj = new papa();
?>Output: I am in Tutorials Point I am not in Tutorials Point
Explanation
In the above example, we have used parent::__construct() to call the parent class constructor.
Case2
If the child does not define a constructor then it may be inherited from the parent class just like a normal class method(if it was not declared as private).
Example
<?php
class grandpa{
public function __construct(){
echo "I am in Tutorials point";
}
}
class papa extends grandpa{
}
$obj = new papa();
?>Output
I am in Tutorials point
Explanation
Here the parent class is called implicitly because in child class we have not declared any constructor function in child class.
Updated on 29-Jun-2020 11:06:57
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