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<?php
//require ‘lib.php‘;
//require ‘lib.php‘;
//include ‘lib.php‘; //The difference between two?
include_once ‘lib.php‘;
// require_once ‘lib.php‘; // only run once
// require_once ‘lib.php‘;
//require ‘lib.php‘;
//require ‘lib.php‘;
sayHello();
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原文地址：http://www.cnblogs.com/htmlphp/p/4842156.html
