What is php class library

Standard PHP Library Standard PHP library, official definition:

The standard PHP library（SPL）is a collection ofinterfaces and classes that are meant to solve common problems。 用于解决典型问题的一组接口与类的集合。

Typical questions:(recommended learning:PHP programming from entry to proficiency)

Mathematical modeling/data structure (solve the problem of how to store data)

Element traversal (the problem of how to view data)

Uniform invocation of commonly used methods (general methods, size of collections)

Class definitions are automatically loaded (allowing PHP programs to automatically adapt to the management requirements of large projects and disperse function implementations into different files)

Contains:

Data structure, basic interface, basic functions, iterators, exceptions and others.

Commonly used data structures of SPL

What is a data structure?

Data structure is the way a computer stores and organizes data. A data structure refers to a collection of data elements that have one or more specific relationships with each other. It solves the problem of how to store and represent data in the software development process.

What data structures does SPL provide:

Doubly linked list, stack, queue, heap, descending heap, ascending heap, priority queue, fixed-length array, object container

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