The new additions to SPL add some useful functionality to PHP that is easy to use, as well as implementations of data structures, such as doubly linked lists, stacks, heaps, and queues.
SPL中的新补充？ php添加了一些有用的并且易于使用的功能，以及数据结构的实现，例如双重链接列表、栈、堆和队列。
Triplify is a small plugin for Web applications, which reveals the semantic structures encoded in relational databases by making database content available as RDF, JSON or Linked data.
Triplify是一种小型的Web应用插件，它能够以rdf、JSON或者Linked Data格式提供数据库的内容，揭示出关系数据库中所保存的数据的语义结构。
And two-way linked list is a list as well as data structures, one of the standard data structure.
而双向链表是链表的一种，也是数据结构的标准数据结构之一。
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