阿帕奇正常，mhsql正常，php5正常，安装源码包无反应？已解决悬赏10积分

本地运行  http://localhost/zentaopms/www/install.php
一片白，没有任何反应。 
自己加了几个 echo "hello <br />";发现到第三个就不动了，是不是这里的有什么问题？

error_reporting(0);

session_start();

define('IN_INSTALL', true);

echo "hello <br />";

/* Load the framework. */

include '../framework/router.class.php';

include '../framework/control.class.php';

include '../framework/model.class.php';

include '../framework/helper.class.php';

echo "hello <br />";

/* Instance the app. */

$app = router::createApp('pms', dirname(dirname(__FILE__)));

echo "hello <br />";