Call Parent Class construct Before Child’s In PHP

Today, We want to share with you Call Parent Class construct Before Child’s In PHP.In this post we will show you php parent constructor with arguments, hear for how to call a constructor for a parent class php we will give you demo and example for implement.In this post, we will learn about PHP Inheritance – Calling parent’s functions in child object with an example.

Call Parent Class construct Before Child’s In PHP

There are the Following The simple About Call Parent Class construct Before Child’s In PHP Full Information With Example and source code.

As I will cover this Post with live Working example to develop php constructor parameters, so the some php abstract class for this example is following below.

If in simple PHP, We are making a child main class of a parent class in which all the both have the PHP __construct function as well as We want to simple call both of them when the simple child object is made, it won’t work.

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This is because, when We Create the seconds child class object, it’s PHP data construct function is called. The parent’s main construct methods is being overridden by the simple child. The PHP manual on OOP (Object Oriented Programming) simple notes this :

IMP Note: PHP Parent constructors are not called data implicitly if the child class defines a PHP simple constructor. In main execute order to run a parent PHP constructor, a call to <b> parent::__construct()</b> within the simple child constructor is required. If the child does not define a php constructor then it may be inherited from the parent data class just like as a normal class method (if it was not declared as private).

Therefor, the parent’s construct function is not called if We are making the child object.

Classes

This is the parent class named “SecondClassChild” :

class SecondClassChild {
 public $dataValue = 0;
 function __construct(){
  $this->dataValue = 1;
 }
}

After that we extend it to Create the child class named “FirstClassChild” :

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class FirstClassChild extends SecondClassChild {
 function __construct(){
  echo $this->dataValue;
 }
}

Now, when We Create the child object, the Data response made by echo shall be nothing so **** :

new FirstClassChild()

Main Reason

In the parent class, we Create a public variable called “dataValue” which is set to 0. When the parent class is made by this :

new SecondClassChild()

the Data value of SecondClassChild::dataValue is changed to “1”. This Data change only takes effect if the parent class is made After that not the PHP child class. Therefor, when We Create the child PHP class, the Simple Data response shall be **** After that not 1.

Best Solution:

But, We may also Create changes first in the parent class and then do the source code in FirstClassChild::__construct(). For that, we add the following source code as the first source code in FirstClassChild::__construct() :

parent::__construct();

After that the whole child class shall become :

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class FirstClassChild extends SecondClassChild {
 function __construct(){
  parent::__construct();
  echo $this->dataValue;
 }
}

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