lambda函数的概念是闭包的基础，并且提供了一种比PHP中已有的create_function函数改进了很多的动态创建函数的方法。
The concept of lambda functions is the basis for closures and provides a much-improved way to create functions on the fly vs. the create_function function already in PHP.
对已有算法进行改进，提出了一种加权的星型聚类算法以学习用户的兴趣特征。
Based on some traditional algorithms, this thesis provides a weighted star cluster algorithm to learn user profile.
目前已有的素数编码方法需要大量素数和大素数，为此提出一种改进的素数编码方法——最多亲兄弟素数，该方法不必每个节点都使用新素数。
The existing prime number labeling method needed a number of primes and some big primes, therefore, an improved prime number labeling method-most brothers prime was proposed.
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