引用官方：
   eAccelerator is a free open-source PHP accelerator, optimizer, and

dynamic content cache. It increases the performance of PHP scripts by

caching them in their compiled state, so that the overhead of compiling

is almost completely eliminated. It also optimizes scripts to speed up

their execution. eAccelerator typically reduces server load and
increases the speed of your PHP code by 1-10 times.</p>

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