PHP扩展之PHP标准库（SPL）概述

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.

• SplDoublyLinkedList
  • SplStack
  • SplQueue

堆

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.

• SplHeap
  • SplMaxHeap
  • SplMinHeap
• SplPriorityQueue

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.

• SplFixedArray

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.

• SplObjectStorage

迭代器

SPL 提供一系列迭代器以遍历不同的对象。

• ArrayIterator
  • RecursiveArrayIterator
• EmptyIterator
• IteratorIterator
  • AppendIterator
  • CachingIterator
    • RecursiveCachingIterator
  • FilterIterator
    • CallbackFilterIterator
      • RecursiveCallbackFilterIterator
    • RecursiveFilterIterator
      • ParentIterator
    • RegexIterator
      • RecursiveRegexIterator
  • InfiniteIterator
  • LimitIterator
  • NoRewindIterator
• MultipleIterator
• RecursiveIteratorIterator
  • RecursiveTreeIterator
• DirectoryIterator (extends SplFileInfo)
  • FilesystemIterator
    • GlobIterator
    • RecursiveDirectoryIterator

接口

SPL 提供一系列接口。

• Countable
• OuterIterator
• RecursiveIterator
• SeekableIterator
• SplObserver
• SplSubject

异常

SPL 提供一系列标准异常。

• LogicException (extends Exception)
  • BadFunctionCallException
    • BadMethodCallException
  • DomainException
  • InvalidArgumentException
  • LengthException
  • OutOfRangeException
• RuntimeException (extends Exception)
  • OutOfBoundsException
  • OverflowException
  • RangeException
  • UnderflowException
  • UnexpectedValueException

SPL函数

• class_implements — 返回指定的类实现的所有接口。
• class_parents — 返回指定类的父类。
• class_uses — Return the traits used by the given class
• iterator_apply — 为迭代器中每个元素调用一个用户自定义函数
• iterator_count — 计算迭代器中元素的个数
• iterator_to_array — 将迭代器中的元素拷贝到数组
• spl_autoload_call — 尝试调用所有已注册的__autoload()函数来装载请求类
• spl_autoload_extensions — 注册并返回spl_autoload函数使用的默认文件扩展名。
• spl_autoload_functions — 返回所有已注册的__autoload()函数。
• spl_autoload_register — 注册__autoload()函数
• spl_autoload_unregister — 注销已注册的__autoload()函数
• spl_autoload — __autoload()函数的默认实现
• spl_classes — 返回所有可用的SPL类
• spl_object_hash — 返回指定对象的hash id

文件处理

SPL 提供 一些与文件相关的类。

• SplFileInfo
• SplFileObject
• SplTempFileObject