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2014
11-07

PHP扩展之PHP标准库(SPL)概述

SPL是用于解决典型问题(standard problems)的一组接口与类的集合。

此扩展只能在php 5.0以后使用,并且从PHP 5.3.0 不再被关闭,会一直有效,成为php内核组件一部份。

数据结构

SPL提供了一组标准数据结构。

双向链表

双向链表 (DLL) is a list of nodes linked in both directions to each others. Iterator's operations, access to both ends, addition or removal of nodes have a cost of O(1) when the underlying structure is a DLL. It hence provides a decent implementation for stacks and queues.

Heaps are tree-like structures that follow the heap-property: each node is greater than or equal to its children, when compared using the implemented compare method which is global to the heap.

阵列

Arrays are structures that store the data in a continuous way, accessible via indexes. Don't confuse them with PHP arrays: PHP arrays are in fact implemented as ordered hashtables.

映射

A map is a datastructure holding key-value pairs. PHP arrays can be seen as maps from integers/strings to values. SPL provides a map from objects to data. This map can also be used as an object set.

迭代器

SPL 提供一系列迭代器以遍历不同的对象。

接口

SPL 提供一系列接口。

异常

SPL 提供一系列标准异常。

SPL函数

文件处理

SPL 提供 一些与文件相关的类。

其他类及接口

编程技巧