spl 教程一 基础应用

spl 是什么

* SPL是Standard PHP Library（PHP标准库）的缩写。
* 根据官方定义，它是“a collection of interfaces and classes that are meant tosolve standard problems
* 目前在使用中，SPL更多地被看作是一种使object（物体）模仿array（数组）行为的interfaces和classes。

spl可以干什么用

 /**         * spl 作用         * （1） 提供了一系列的标准的数据机构                    SplDoublyLinkedList — The SplDoublyLinkedList class                    SplStack — The SplStack class                    SplQueue — The SplQueue class                    SplHeap — The SplHeap class                    SplMaxHeap — The SplMaxHeap class                    SplMinHeap — The SplMinHeap class                    SplPriorityQueue — The SplPriorityQueue class                    SplFixedArray — The SplFixedArray class                    SplObjectStorage — The SplObjectStorage class         * （2） 提供了一系列迭代器                    AppendIterator — The AppendIterator class                    ArrayIterator — The ArrayIterator class                    CachingIterator — The CachingIterator class                    CallbackFilterIterator — The CallbackFilterIterator class                    DirectoryIterator — The DirectoryIterator class                    EmptyIterator — The EmptyIterator class                    FilesystemIterator — The FilesystemIterator class                    FilterIterator — The FilterIterator class                    GlobIterator — The GlobIterator class                    InfiniteIterator — The InfiniteIterator class                    IteratorIterator — The IteratorIterator class                    LimitIterator — The LimitIterator class                    MultipleIterator — The MultipleIterator class                    NoRewindIterator — The NoRewindIterator class                    ParentIterator — The ParentIterator class                    RecursiveArrayIterator — The RecursiveArrayIterator class                    RecursiveCachingIterator — The RecursiveCachingIterator class                    RecursiveCallbackFilterIterator — The RecursiveCallbackFilterIterator class                    RecursiveDirectoryIterator — The RecursiveDirectoryIterator class                    RecursiveFilterIterator — The RecursiveFilterIterator class                    RecursiveIteratorIterator — The RecursiveIteratorIterator class                    RecursiveRegexIterator — The RecursiveRegexIterator class                    RecursiveTreeIterator — The RecursiveTreeIterator class                    RegexIterator — The RegexIterator class         *         *         * （3） 提供了一系列接口                    Countable — The Countable interface                    OuterIterator — The OuterIterator interface                    RecursiveIterator — The RecursiveIterator interface                    SeekableIterator — The SeekableIterator interface         * （4） 提供了一系列标准异常                    BadFunctionCallException — The BadFunctionCallException class                    BadMethodCallException — The BadMethodCallException class                    DomainException — The DomainException class                    InvalidArgumentException — The InvalidArgumentException class                    LengthException — The LengthException class                    LogicException — The LogicException class                    OutOfBoundsException — The OutOfBoundsException class                    OutOfRangeException — The OutOfRangeException class                    OverflowException — The OverflowException class                    RangeException — The RangeException class                    RuntimeException — The RuntimeException class                    UnderflowException — The UnderflowException class                    UnexpectedValueException — The UnexpectedValueException class         *  (5) 一系列方法                    class_implements — Return the interfaces which are implemented by the given class or interface                    class_parents — Return the parent classes of the given class                    class_uses — Return the traits used by the given class                    iterator_apply — Call a function for every element in an iterator                    iterator_count — Count the elements in an iterator                    iterator_to_array — Copy the iterator into an array                    spl_autoload_call — Try all registered __autoload() function to load the requested class                    spl_autoload_extensions — Register and return default file extensions for spl_autoload                    spl_autoload_functions — Return all registered __autoload() functions                    spl_autoload_register — Register given function as __autoload() implementation                    spl_autoload_unregister — Unregister given function as __autoload() implementation                    spl_autoload — Default implementation for __autoload()                    spl_classes — Return available SPL classes                    spl_object_hash — Return hash id for given object         *         *         */

spl 案例和应用