What is Constructor? Explain with Example

What is Constructor:

• is a member function of a class which initializes objects of a class
• If you create a __construct() function, PHP will automatically call this function when you create an object from a class.
• Class name and method name are same that called as a constructor

Example: 

<?php

class Employee

{

var $empcode;

var $empname;

function Employee()

//not passed as a parameter

{

$this->empcode = 100;

$this->empname='avadh tutor';

}

function display()

{

echo "<h1><br>";

echo "<br>Emp Code = " . $this->empcode;

echo "<br>Emp Name = " . $this->empname;

echo "</h1>";

}

};

$instance = new Employee(); // Constructor automatically call

$instance -> display();

?>

How to Create Simple Class using PHP

What is Class in PHP

• class is a container that can contain variables, constructors, functions etc.
• This is a programmer-defined data type, which includes local functions as well as local data.
• A class is a self-contained, independent collection of variables and functions which work together to perform one or more specific tasks, while objects are individual instances of a class.

Syntax:

class classname

{

variables

function functionname

{

--

}

}

class object

calling function

display function

Example: 

<?php

class student

{

//var $rollno;

//var $name;

function get()

{

$this->rollno = 10;

$this->name = 'raj';

}

function display()

{

echo "<pre><br>Roll No : " . $this->rollno;

echo "<br>Name : " . $this->name;

}

};

$obj = new student();

$obj->get();

$obj->display();

?>

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