What is Constant in php?

constant is a user defined name or identifier. which can't be changed during the execution of the php program. it is the final variable. its value can't be change.

in php, there are two ways to define constant.

Using define() function

Using const keyword

NOTE : Conventionally, PHP constants should be defined in uppercase letters.

How to define constant in php :

Syntax :

define(name, value, case-insensitive)

name: specifies the constant name

value: specifies the constant value

case-insensitive: Default value is false. It means it is case sensitive by default.

File name : index.php

<?php
define("MSG","Hello ittutorial");
echo MSG;
?>

Output :-

Hello itechtuto

File name : index.php

<?php
define("MSG","Hello ittutorial", true);
// //not case sensitive echo MSG;
echo msg;
?>

Output :-

Hello itechtuto Hello itechtuto

File name : index.php

<?php
define("MSG","Hello ittutorial", false);
// //case sensitive echo MSG;
echo msg;
?>

Output :-

Hello itechtuto Notice: Use of undefined constant message - assumed 'msg' in C:\wamp\www\vconstant3.php on line 4 msg

const keyword :-

const keyword is used for defien constant variable.

it is faster than define()

It is always case sensitive.

<?php
const MSG = "Hello ittutorial";
echo MSG;
?>

Previous Next

Review & Rating

0.0 / 5

0 Review

5

(0)

4

(0)

3

(0)

2

(0)

1

(0)

Most Popular Tutorials

Most Popular Tutorials :-

What is Constant in php?

NOTE : Conventionally, PHP constants should be defined in uppercase letters.

How to define constant in php :

File name : index.php

Output :-

File name : index.php

Output :-

File name : index.php

Output :-

const keyword :-

PHP

PHP OOPs

Codeigniter

Laravel

NODE.JS

Javascript

0.0 / 5

0 Review

Write Review Here

Most Popular Tutorials

Important Link