include的小疑点

include的小问题
1.php

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php include('2.php');?>

2.php:

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->    aaaaaaaa

访问1.php的时候可以显示出aaaaaaaa。

但是我有一个问题，在1.php中，include()方法实质上不就是把2.php的内容替换include(2.php)吗？即：

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php <html>                    aaaaaaaa

성명：

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