3. PHP Constant Variables

Constant Variable Variable types we use it if we want to save, no real change.
We use Function define () to create Constant Variable.
Syntax:

<?php

  define(string constant_name,vallue[,1|0]);

?>

1: case sensitive (sensitive or large) 0: case insensitive (not case sensitive)

For example:

<?php

  define("server","localhost",1);

  echo server;  // output : localhost

?>