PSI为什么要用PHP开发？这个问题，很多网友都问过我，今天就写一篇博客来讲讲这个历程。
概括讲，主要原因是：省钱。
2011年我启动了一个开源项目：CRM8000，当时是host在 teamhost上，teamhost后来的演变见这里：http://segmentfault.com/a/1190000000374128 。
所以，crm8000@qq.com成了我的注册邮箱，之后就一直沿用。
CRM8000被OSC收录的时间是：2011年4月12日。
这一个版本的CRM8000，我是用java + GWT + MySQL来写的。
之后，我把CRM8000搬家到 www.tigris.org , 我现在不能访问它了，似乎是被墙了，凭记忆我项目的网址是: http://abc.tigris.org ,我今天没法验证。
再然后，应该是2012年左右，我用微软的全套技术：ASP.NET + SQLServer 开始重写CRM8000，host在http://www.codeplex.com 上，不过，你别去搜索了，我在去年已经把它彻底删除了。
再然后，是2014年12月，我决定用Grails重写CRM8000。这个用Grails重写的CRM8000，现在host在OSC上： 。
写的差不多了，我把CRM8000部署到OSC提供的演示平台，结果我傻眼了：Grails应用需要大量的内存。这个时候，我面临两个选择：花钱升级Paas的内存；或者是放弃。
几天一纠结，决定放弃，再重写。
通过这次，我对Grails产生了好感，所以也就没有删除OSC上的CRM8000这个项目，而是重新来个项目，这就是PSI。
PSI项目我学乖了，从第一行代码开始，我就在PaaS上测试，然后让我的代码兼容PaaS。
过程讲完了，算是一点PSI项目的收获和总结。
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