Study Notes---Dahua PHP Design Pattern_PHP Tutorial

Study notes---Dahua PHP design pattern

PHPStorm IDE

Selection of development fonts: Source Code Pro, Courier New, Concolas

php namespace: can resolve conflicts between methods with the same name in different classes

namespace test1;

function test()｛

｝

Auto loading:

function __autoload($class){

require __DIR__.'/'$class.'.php';

}

spl_autoload_register(); This function can allow multiple autoloads and must be in the first line

For example:

spl_autoload_register('autoload1');

spl_autoload_register('autoload2');

function autoload1($class){

require __DIR__.'/'$class.'.php';

}

function autoload2($class){

require __DIR__.'/'$class.'.php';

}

require later class name::method name call();

For example: Test1::test();Test2::test();

PSR-0 Specification

1 The namespace of php must be consistent with the absolute path

2 The first letter of the class name and the file name must be capitalized

3 Except for intersection files, other ".php" must have only one class and cannot have executable code. For example: echo();

__DIR__ Magic constant Get the path of the current file

__FUNCTION__ Magic constant Get the current method

__METHOD__ Magic constant to get the current class name and method

BASEDIR Website root directory

SPL standard introduction

SplStack(); first-in-last-out stationary data structure

$stack=new SplStack();

$stack->push("test1"); //First inbound

$stack->push("test2"); //Advanced

echo $stack->pop(); //Last exit outbound test2

echo $stack->pop(); //pop out test1

SplQueue(); first-in-first-out queue data structure

$SplQueue=new SplQueue();

$SplQueue->enqueue("test1"); //Advanced

$SplQueue->enqueue("test2"); //Advanced

echo $SplQueue->dequeue(); //First out test1

echo $SplQueue->dequeue(); //First out test2

SplMinheap(); Heap data structure

$SplMinheap=new SplMinheap();

$SplMinheap->insert('test1');

$SplMinheap->insert('test2');

echo $SplMinheap->extract(); test1

echo $SplMinheap->extract(); test2

$sqlFixedArray(); Fixed size array (fixed length)

$array= new $sqlFixedArray(10); (set the data length in brackets)

$array['0']=1;

$array['8']=8;

PHP chain test operation implementation The advantage is that you can use one line of code to implement many functions

$ob->where()->order()->limit()->select();

PHP advanced object-oriented features

Using PHP magic methods

1 __get/__set                                                                                                                                                                                      

2 __call/__callStatic //Used to control PHP method calls/control class static method calls

3 __toString //Convert a PHP object into a string

4 __invoke                                                                                                                                                                                  

The printed result will be printed regardless of whether the subscripts 1-7 have a value. If there is no value, a null value will be automatically given

PHPstorm configuration and installation

http://blog.csdn.net/ikscher/article/details/43672365

Three basic design patterns

Factory pattern: Use factory methods or classes to generate objects, instead of directly replacing new with new in the code

Benefits: In case of changes, you only need to change one factory pattern class

Singleton mode: allows objects of a certain class to be created only once

Benefits: No matter how many instance objects are needed, the database is actually only connected once

Registration mode: Global shared exchange object works better with factory mode

Benefit: globally shared exchange object

Trying the registration tree together with the factory mode can reduce the waste of memory resources. Because the same object is called. You can also add data pairs

Image mapping mode reduces direct operations on the database and operates the properties of the class library

Adapter Mode

Encapsulate different interfaces into a unified API

PHP classes are single inheritance, that is, multiple inheritance is not supported. When a class requires the functions of multiple classes, inheritance is powerless. For this reason, PHP cited

Incorporated class interface technology.

If all methods in an abstract class are abstract methods, no variables are declared, and all members in the interface are public

Permissions, then this special abstract class is called interface.

The interface is defined using the keyword interface, and the keyword implements is used to implement the methods in the interface, which must be fully implemented.

Strategy Pattern Encapsulates a specific set of behaviors and algorithms into classes to adapt to certain specific contexts. This pattern is the Strategy Pattern

For example, judging the gender of the user and giving different needs

Write the man’s needs first and then write the woman’s needs

Decide which requirement to call based on the transmitted value, instead of using cumbersome judgment to implement it. If you want to change it, just write another requirement

Data object mapping mode

1 Data object mapping mode is to map objects and data storage. Operations on an object will be mapped to operations on data storage

Observer Pattern When the state of an object changes, all objects that depend on it will be notified and automatically updated. Useful When an event occurs

When it is generated, everything related to it can be written in the observer class

Prototype mode is similar to factory mode, both are used to create objects

Different from the implementation of the factory pattern, the prototype pattern creates a prototype object in advance and then creates a new object by cloning the prototype object.

This eliminates the need for initialization when creating a class

Prototype pattern is suitable for the creation of large objects. Creating a large object requires a lot of overhead. If it is new every time, it will consume a lot of money. The prototype mode is only

Memory copy is required.

Use: For example, a class object created involves many loops and the like. After new is created, the object can be cloned directly the next time it is called

Instead of continuing with new

Decorator mode Decorator mode (Decorator) can dynamically add and modify the function of a class. A class provides a function. If you modify

And adds additional functionality to the traditional editing mode, you need to write a subclass to inherit it and reimplement the class method

Using the decorator pattern, you only need to add a decorator object at runtime to achieve maximum flexibility.

Iterator pattern traverses the internal elements of an aggregate object without knowing the internal implementation

Compared with traditional programming patterns, the iterator pattern can hide the operations required to traverse elements

namespace test;

class AllUser implements Iterator ｛//Call the iterator interface provided by PHP itself

protected $ids;

protected $data = array();

protected $num ;

function __construct(){

//Instantiate the model

//Read database

}

function valid(){//Verify whether there is another element currently

}

function next(){//Get the next element

}

function current(){ //Get the current element

}

function rewind(){//Reset the entire iterator

}

function key(){//Get the position in the iterator

}

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Agent Mode

Establish a proxy object (proxy) between the client and the entity. The client delegates all operations on the entity to the proxy object, hiding the entity

Specific implementation details of

The proxy can also be separated from the business code and deployed to another server. The business code delegates tasks through RPC.

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