README.md

Variables

http://php.net/manual/en/language.variables.php

1. Basics
   • http://php.net/manual/en/language.variables.basics.php
2. Predefined Variables
   • http://php.net/manual/en/language.variables.predefined.php
3. Variable scope
   • http://php.net/manual/en/language.variables.scope.php
4. Variable variables
   • http://php.net/manual/en/language.variables.variable.php
5. Variables From External Sources
   • http://php.net/manual/en/language.variables.external.php

<?php

define('IA','I Can have a diferance case',true);
define('NOT_CLEAR','I have a strong case');

echo IA . PHP_EOL;
echo Ia . PHP_EOL;
echo NOT_CLEAR . PHP_EOL;
echo Not_clear . PHP_EOL; // EROR