常量不能在服務器上得到解決

Question

constants.php

<? 
    define('GREETING', 'Hello World'); 
?> 

的index.php

<?php 
    require("constants.php"); 
    echo GREETING; 
?> 

此代碼給我一個錯誤：PHP Notice: Use of undefined constant GREETING - assumed 'GREETING'

（服務器1 - 不工作） 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 

（服務器2 - 工作）的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. 

（開發環境 - 工作）的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. 

可能是什麼問題，我該怎麼辦讓它適用於服務器1？

Answer 1

上一頁程序員作了使用哪個導通塊爲註釋