include()和require()的区别 这相信是PHP中最基本的问题了，也是很多公司面试时必考的题呵呵。
给大家复习一下：
require() :如果文件不存在，会报出一个fatal error.脚本停止执行
include() : 如果文件不存在，会给出一个 warning，但脚本会继续执行
这里特别要注意的是：
使用include()文件不存在时，脚本继续执行，这种情况只出现在PHP 4.3.5之前，这一点，往往被人忽视。
推荐使用require_once()和include_once()，可以检测文件是否有重复包含。
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