Tips for using MVC pattern in php_PHP tutorial

Application of MVC pattern in php
First, let me give an example:
A simple article display system
During the simple period, we assume that this article system is read-only, which means that this example will not involve articles. The release starts now.
Since it only involves database reading, I defined two interfaces


Interface DataOperation
{
public function select($info);
public function selectNum ($info);
}


The above interface defines the interface for reading data, and the select method will return the required articles. The selectNum method returns the total number of articles, which is used for paging display.$info is an array used to store query conditions


Interface DataSource
{
public static function getInstance();
}

Here we assume that we It operates a database. DataSource defines an interface. All instance classes that implement this interface will get a static object


Interface Controller
{
public function pop();
public function push();
public function execute();
}
Interface View
{
public function display();
}



Okay, let’s implement it.
The following defines a class to implement the DataSource interface. This class uses the singleton pattern


class DataBaseSource implements DataSource
{
public static $instance = null;
public static function getInstance()
{
if(self::$instance == null)
{
self::$instance == new PDO(" mysql:host=localhost;dbname=article","root","123456"); >Define an abstract class to implement DataOperation. We need to share a database connection, so I initialize the database object in the abstract class, so that all subclasses can share this object


abstract class DataBaseOperation implementations DataOperation
{
protected $db = null;
public function __construct()
{
$this->db = DataBaseSource::getInstance();
}
public function select($info);
}


Let me write a business subclass to implement the abstract class DataBaseOperation


class Tech extends DataBaseOperation
{
public function select($info)
{
//Implement your code here
}
public function selectNum($info)
{
/ /Implement your code here
}
}


We have implemented the business logic layer, and the following is the control layer


class ViewController implements Controller
{
private $mod = array();
public function push($key,$value);
{
//Implement your code and register the class into $this-> mod;
}
public function pop($key)
{ 🎜> public function execute($key)
{
//Implement your code here and generate an example. Pay attention to the new features of php5, exception handling
}
}
Okay Okay, here is the presentation layer, where Interface View
abstract ArticleView implements View
{
protected $smarty = null;
public function __construct()
{
$this- >smarty = new Smarty();
/// Below you can define some attribute values ​​​​of smarty
}
}
Specific pages, such as the display page of scientific articles
class TechArticleView extends ArticleView
{
public function display()
{
//Implement your code and call the Tech class and more DataBaseOperation subclasses
}
}
Okay Ok, here is the main entrance index.php
try
{
$viewController = new ViewController();
$viewController->push("tech",TechArticleView);
// Continuous increase
$mod = $_GET["mod"]:$_GET["mod"]:$_POST["mod"];
//Finally
$viewController->execute($ key);
}
catch(Exception $e)
{
            //How to handle exceptions is your business
}

http://www.bkjia.com/PHPjc/318340.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/318340.htmlTechArticleUsing the MVC pattern in php First, let me give an example: A simple article display system During the simple period, we assume This article system is read-only, which means that this example will not involve articles...