<?php

//"const" and "define" for constants and
//"$" for variables

//Int
$number = 42; 
const maxInt = PHP_INT_MAX;
const Mb = 1048576;

//Double
const exp = 2.71828;
$billion = 1E+9;
define('pi', 3.14);
echo pi, "\n";

//String
const greeting = "Hello";

//Multiline String
$text = "this is some\n" .
    "multiline text";

$multiLine = "this is some
multiline text";
echo $multiLine, "\n";

//Bool
const sunIsStar = true;
$earthIsStar = false;

//Character 'A'    
const charA = 'A'; //"\u{41}"
echo charA;