What is Facade Pattern in PHP? What are his strengths? What are the applicable scenarios?

There are too many patterns in PHP that we need to understand and master. I wonder how many patterns you have mastered after studying for so long? What is Facade Pattern in PHP? What are his strengths? What are the applicable scenarios? How much do you know? This article will teach you what is the facade pattern in PHP? What are his strengths? What are the applicable scenarios? Let’s learn together

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Facade Mode

Definition: Facade mode (sometimes also called appearance mode) refers to providing a unified interface to access multiple different interfaces of multiple subsystems

. It is A set of interfaces in the subsystem provides a unified high-level interface

Regarding the facade mode, we take the code as an example, create a new file and define a class in the file,

The code is as follows:

<?php
class Light
{
  function turnOn( )
{
  echo &#39;打开闪光灯<br />&#39; ;
}
function turnOff( )
{
  echo &#39;关闭闪关灯<br />&#39; ;
}
}
class Camera
{
  function active( )
echo &#39;打开照相机<br />&#39; ;
}
function deactive()
{
  echo &#39; 关闭照相机<br />&#39; ;
}
}
class Facade
{
protected $light;
protected $camera;
function _construct( )
{
$this->light = new Light();
$this->camera = new Camera( ) ;
}
function start( )
{
$this->light->turnOn() ;
$this->camera->active( ) ;
}
function stop()
{
$this->light->turn0ff();
$this->light->deactive();
}
}
$light = new Light();
$camera = new Camera();
$light ->turn0n( ) ;
$camera->active() ;
}

Advantages:

1. It shields the subsystem components from the customer, thus reducing the number of objects processed by the customer and making the subsystem

More convenient to use

2. It realizes the loose coupling relationship between the subsystem and the client

3. If the application needs it, it does not restrict them from using subsystem classes. Therefore, you can choose between system ease of use and usability

Applicable scenarios:

1. Provide a set of interfaces for some complex subsystems

2. Improve the independence of subsystems

3. In the hierarchical structure, you can use the facade pattern to define the interface of each layer of the system

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