通过首先迁移应用程序中重要的和更具风险的部件，并及早修改工作中的进度和优先顺序，您可以降低一些风险。
By migrating the important and riskier parts of your application first, you mitigate some of that risk by allowing schedules and priorities to change early on in the effort.
但如果消息顺序对应用程序的正常工作非常重要又该如何呢？
But what if message order is vital to the functioning of the application?
使用标准的PHP V4和更低版本，必须按顺序执行PHP应用程序的所有工作。
With standard PHP V4 and lower, all the work of a PHP application had to be done sequentially.
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