默认phpnow的eAccelerator是没有开启的，今天开启下试试，发现开启后apache无法启动，网站无法打开。
查看日志发现：
PHP Warning: [eAccelerator] This build of "eAccelerator" was compiled for PHP version 5.2.9-2. Rebuild it for your PHP version (5.2.10) or download precompiled binaries.\n in Unknown on line 0
PHP Fatal error: Unable to start eAccelerator module in Unknown on line 0
The Apache_pn service is restarting.
Starting the Apache_pn service
The Apache_pn service is running.
pid file D:/PHPnow/Apache/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?

找到问题了，原来是提供的eAccelerator版本不对,网上找个正确的版本,放到D:\PHPnow\php-5.2.10-Win32\ext目录,
然后再改D:\PHPnow\php-5.2.10-Win32\php-apache2handler.ini的1342行为:
zend_extension_ts="..\..\php-5.2.10-Win32\ext\eAccelerator0953_5.2.10.dll"
重新开始PHPNOW中的eAccelerator，正常了！
提供一个PHP5.2.10版本的eAccelerator下载：
http://bbs.dxztc.com/thread-10840-1-1.html