php define constant

1<?php
2    define('CONSTANT', 'Hello world !');
3    const CONSTANT = 'Hello world !';
4    const NEW_CONSTANT = CONSTANT.' And beyond...';
5    const ANIMALS = array('dog', 'cat', 'ant');
6    define('ANIMALS', array('dog', 'cat', 'ant'));
7?>

1<?php
2define("PI",3.14);
3echo PI;
4echo constant("PI");
5?>

1<?php
2 define("GREETING", "Constant value ");
3echo GREETING;
4?>
5 

1class Human {
2  const TYPE_MALE = 'm';
3  const TYPE_FEMALE = 'f';
4  const TYPE_UNKNOWN = 'u'; // When user didn't select his gender
5  
6  .............
7}