constant cannot be resolved on a server - php

constants.php
<?
define('GREETING', 'Hello World');
?>
index.php
<?php
require("constants.php");
echo GREETING;
?>
This code gives me an error : PHP Notice: Use of undefined constant GREETING - assumed 'GREETING'
(Server 1 - Not Working) Ubuntu 14.04
PHP 5.5.9-1ubuntu4.14 (cli) (built: Oct 28 2015 01:34:46)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies
(Server 2 - Working) CentOS 6.3
PHP 5.4.13 (cli) (built: Mar 14 2013 08:57:49)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
with the ionCube PHP Loader v4.6.0, Copyright (c) 2002-2014, by ionCube Ltd.
(Dev Environment - Working) Windows 8.1
PHP 5.5.9 (cli) (built: Feb 5 2014 13:02:39)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
with the ionCube PHP Loader v4.5.3, Copyright (c) 2002-2014, by ionCube Ltd.
What could be the problem and how do I make it work for Server 1?


Previous programmer made used of short tags which turned the block into a comment

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