gae-php-helloworld在gce-debian和centos实例上提供了带有本地服务器的白色屏幕

我正试图在gce-debian和/或gce-centos实例上运行gae-php-hellowold。https://developers.google.com/appengine/docs/php/gettingstarted/helloworld

helloworld示例在gce-debian和gce-centos系统上运行时会产生PHP的死亡白屏幕。每个实例都是在过去48小时内创建的新构建。

我的最新版本是centos，所以我将描述那个env。

Python:

[stephen@skc-php-dev-centos-00 ~]$ which python
/usr/local/bin/python
[stephen@skc-php-dev-centos-00 ~]$ python -V
Python 2.7.6
[stephen@skc-php-dev-centos-00 ~]$ 

PHP:

[stephen@skc-php-dev-centos-00 bin]$ ./php -v
PHP 5.4.15 (cli) (built: Dec 10 2013 20:31:32) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
[stephen@skc-php-dev-centos-00 bin]$ 

谷歌应用程序：

[stephen@skc-php-dev-centos-00 google_appengine]$ cat VERSION
release: "1.8.8"
timestamp: 1383722570
api_versions: ['1']
supported_api_versions:
 python:
    api_versions: ['1']
 python27:
   api_versions: ['1']
 go:
  api_versions: ['go1']
[stephen@skc-php-dev-centos-00 google_appengine]$ 

启动helloworld:的命令

 /home/stephen/skc-local/google/google_appengine/dev_appserver.py --php_executable_path=/home/stephen/skc-local/bin/php /home/stephen/code/google-php/helloworld

服务器启动良好：

WARNING  2013-12-11 10:58:47,524 api_server.py:331] Could not initialize images API; you are likely missing the Python "PIL" module.
INFO     2013-12-11 10:58:47,538 api_server.py:138] Starting API server at:      http://localhost:40256
INFO     2013-12-11 10:58:47,556 dispatcher.py:171] Starting module "default" running at: http://localhost:8080
INFO     2013-12-11 10:58:47,557 admin_server.py:117] Starting admin server at: http://localhost:8000
INFO     2013-12-11 10:59:33,646 module.py:617] default: "GET / HTTP/1.1" 200 -
INFO     2013-12-11 10:59:33,702 module.py:617] default: "GET /favicon.ico HTTP/1.1" 200 -

当我访问服务器时，我得到了200的响应，然而当我访问服务器时

http://localhost:8080/ 

我唯一看到的是可怕的PHP死亡白屏幕。

看来dev服务器没有任何错误日志记录。

我的代码：helloworld.php

<?php
   echo 'Hello, World!';

app.yaml

application: helloworld
version: 1
runtime: php
api_version: 1
handlers:
- url: /.*
  script: helloworld.php

我非常认真地遵守了指示；在这一点上，我都非常了解他们。

任何见解或建议都将不胜感激。