用传统的经验函数估算软件成本有很多局限性，采用基于范例库推理的估算方法可以很好地弥补其中的问题。

Software cost estimate with the traditional experience function has the shortcoming, and applying CBR estimate method can make up these problems.

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本文假设您已经具有一些使用PHP的经验，并能够使用函数来传递变量并返回结果。

This article assumes that you have some experience using PHP already and can use a function to pass a variable and return a result.

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创建函数需要一定的编程经验，但是并不不是很麻烦。

You need a modicum of programming savvy to create functions, but nothing onerous.

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