PHP提供了一个很好的线索，指出了错误所在:

PHP gives a pretty good clue as to what is wrong:

require_once(__DIR__android_connect/db_connect.php)

在我看来这错了.您应该将代码更改为:

Which looks wrong to me. You should change the code to:

require_once(__DIR__ .'/android_connect/db_connect.php')