在app引擎上提供多个PHP文件时出错

I'm having issues serving a PHP app on Google app engine. It works, but there are some files (like css and images) that aren't displaying.

Assuming I have a web application in a folder of the nature displayed below:

|_admin
|   |_images
|   |   |_admImage.png
|   |_index.php
|   |_dashboard.php
|_includes
|  |_connection.php
|_styles
|   |_css
|   |   |_style.css
|   |_js
|   |   |_scripts.js
|   |_img
|   |   |_favicon.ico
|   |_ |_welcome.gif
|_book_imgs
|  |_book1.jpeg
|_users
|   |_images
|   |   |_passport.jpeg
|   |   |_index.php
|   |_ |_books.php
|_index.php
|_books.php

The connection.php file in the includes folder is linked to every single .php file in every folder. It connects the individual pages to the database. The stylesheets and images (such as favicon) from the style folder also connects to every single page.

If I'm to publish on Google app engine, what should the app.yaml file look like?