我仿照改了一个简单的东西（简单的通讯录），在浏览器上运行时发现了很多错误，看看
Warning: Use of undefined constant Name - assumed 'Name' in F:\yangjianhua\新建文件夹 (2)\index.php on line 89

Warning: Use of undefined constant Address - assumed 'Address' in F:\yangjianhua\新建文件夹 (2)\index.php on line 90

Warning: Use of undefined constant MailBox - assumed 'MailBox' in F:\yangjianhua\新建文件夹 (2)\index.php on line 91

Warning: Use of undefined constant OICQ - assumed 'OICQ' in F:\yangjianhua\新建文件夹 (2)\index.php on line 92

Warning: Use of undefined constant PhoneNum - assumed 'PhoneNum' in F:\yangjianhua\新建文件夹 (2)\index.php on line 93

这是什么原因呀？
帮帮忙