php的缓存技术目的是为了什么而设置的
尤其是smarty技术，知道是缓存，但主要目的是啥呢
------解决方案--------------------
例如一个页面,需要执行很多操作才可以显示出结果的,如果每次访问都要进行操作,就会很慢。
所以，当第一次执行时，就将结果保存起来，下一次访问直接显示结果。这样可以减少操作，快速响应。
当然，要设置一个过期时间，当过期则重新生成。
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