刚接触php不久，碰到include和require, 在网上查了很久，很多人也做了比较，有些不大正确，有误导之嫌，最权威的正确的答案在这里：http://cn.php.net/manual/zh/function.include.php。
看了如果还不明白的话，我做了以下测试，
情况一：
测试结果：
warning: include(./est.php): failed to open stream: no such file or directory in .../test1.php on line 2 warning: include(): failed opening './est.php' for inclusion (include_path='.:/usr/local/cellar/php/5.3.10/lib/php') in .../test1.php on line 2
continue...
情况二：
测试结果：
warning: require(./est.php): failed to open stream: no such file or directory in .../test1.php on line 2 fatal error: require(): failed opening required './est.php' (include_path='.:/usr/local/cellar/php/5.3.10/lib/php') in .../test1.php on line 2
此处continue字符串没有打印出来。