hey guys, welcome back to my channel Ndev tuts.In this tutorial, we will learn
about PHP constants. let's talk about PHP constant. constant are like variables
except that once they are defined they cannot be changed or undefined. a
constant is an identifier or name for a simple value. the value cannot be
changed during the script. a valid constant name starts with a letter or
underscore. no $ sign before the constant name. syntax of PHP constants to
create a constant use the define function. name: specify the name of the
constant. value: specify the value of the constant
case insensitive: specify whether the constant name should be case insensitive
default is false. let's see the example of PHP constant. create a PHP file
constant.php
write a program to calculate area of circle. let's start writing a code
Save the code. let's run the program
the output of the code will be this
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