PHP Design pattern Strategy (strategy mode) _php skills

Copy Code code as follows:

<?php
/**
* Policy mode (strategy.php)
*
* Define a series of algorithms, encapsulate them one by one, and make them interchangeable with each other, and the change in the algorithm can be independent of the client using it
*
*/

---The following is a closed----of a series of algorithms
Interface cachetable
{
Public function get ($key);
Public function set ($key, $value);
Public Function del ($key);
}

Do not use caching
Class NoCache implements Cachetable
{
Public Function __construct () {
echo "Use nocache<br/>";
}

Public function Get ($key)
{
return false;
}

Public function set ($key, $value)
{
return true;
}

Public Function del ($key)
{
return false;
}
}

File caching
Class Filecache implements Cachetable
{
Public Function __construct ()
{
echo "Use filecache<br/>";
File Cache Constructor
}

Public function Get ($key)
{
Implementation of the Get method for file caching
}

Public function set ($key, $value)
{
Set method implementation of file caching
}

Public Function del ($key)
{
Implementation of File Cache Del method
}
}

Ttserver
Class Ttcache implements Cachetable
{
Public Function __construct ()
{
echo "Use ttcache<br/>";
Ttserver Cache Constructor
}

Public function Get ($key)
{
Ttserver Cache's Get method implementation
}

Public function set ($key, $value)
{
Implementation of Set method for Ttserver caching
}

Public Function del ($key)
{
Implementation of Ttserver Cache Del method
}
}

--The following are policies that use no caching------
Class Model
{
Private $_cache;
Public Function __construct ()
{
$this->_cache = new NoCache ();
}

Public Function Setcache ($cache)
{
$this->_cache = $cache;
}
}

Class Usermodel extends Model
{
}

Class Porductmodel extends Model
{
Public Function __construct ()
{
$this->_cache = new Ttcache ();
}
}

--an example---
$mdlUser = new Usermodel ();
$mdlProduct = new Porductmodel ();
$mdlProduct->setcache (New Filecache ()); changing caching policies
?>