PHP

php const

<?php
    define('CONSTANT', 'Hello world !');
    const CONSTANT = 'Hello world !';
    const NEW_CONSTANT = CONSTANT.' And beyond...';
    const ANIMALS = array('dog', 'cat', 'ant');
    define('ANIMALS', array('dog', 'cat', 'ant'));
?>

php constant

<?php
define("PI",3.14);
echo PI;
echo constant("PI");
?>

PHP constants

//define(name,value);

define("PI",3.1419); 

PHP constant

class Human {
  const TYPE_MALE = 'm';
  const TYPE_FEMALE = 'f';
  const TYPE_UNKNOWN = 'u'; // When user didn't select his gender
  
  .............
}

Constants In PHP

<?php
define("A", 100);
define("B", 200);
echo A;
echo "<br>";
echo B;
?>

PHP Constants

<?php
define("GREETING", "Welcome to my profile");
echo GREETING;
?>