PHP：任意文件格式以html展示
将一个html文件保存成后缀为aaa（或其他任意格式）的文件（如：test.aaa），然后在浏览器中打开的时候，发现浏览器没法以网页形式展示，而是将test.aaa中的html源码显示出来。
而如果保存成：test.html的话，在网页中是正常的。
比如：在网站根目录下，有2个文件：test.html和test.aaa
代码如下：
<code> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <input type="bottom" value=""></code>
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