Use of MVC in PHP

First, let me give an example:
A simpleArticleDisplay System
In simple cases, we assume that the article system is read-only. That is to say, this example will not involve the publishing of the Article. Now it is started.
Since it only involves reading databases, I have defined two interfaces.

Interface dataoperation
{
Public Function select ($ info );
Public Function selectnum ($ info );
}
The preceding interface defines the interface for reading data. The select method returns the required articles. The selectnum method returns the total number of articles, which is used for pagination. $ Info is an array used to store query conditions.
Interface datasource
{
Public static function getinstance ();
}
Here we assume that we operate on the database, and 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 mode.
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 ");
}
Return self: $ instance;
}
}
Define an abstract class to implement dataoperation. We need to share a database connection, so I initialize this database object in the abstract class so that all subclasses can share this object.
Abstract class databaseoperation implements dataoperation
{
Protected $ db = NULL;
Public Function _ construct ()
{
$ This-> DB = databasesource: getinstance ();
}
Public Function select ($ info );
Public Function select ($ info );
}
Below I will write a business subclass to implement the abstract class databaseoperation
Class tech extends databaseoperation
{
Public Function select ($ info)
{
// Implement your Code
}
Public Function selectnum ($ info)
{
// Implement your code here
}
}
The business logic layer is implemented. 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)
{
// Implement your code and set $ this-> mod [$ key] to NULL;
}
Public Function execute ($ key)
{
// Implement your code here to generate an instance. Use the new features of PhP5 to handle exceptions.
}
}
Okay. The following is the presentation layer. The interface view will be implemented here.
Abstract articleview implements View
{
Protected $ smarty = NULL;
Public Function _ construct ()
{
$ This-> smarty = new smarty ();
/// You can define some property values of smarty below
}
}
A specific page, such as a display page of a tech article
Class techarticleview extends articleview
{
Public function display ()
{
// Implement your code, call the tech class and more databaseoperation subclasses
}
}
Okay. The following is the index. php entry.
Try
{
$ Viewcontroller = new viewcontroller ();
$ Viewcontroller-> push ("tech", techarticleview );
// Continuous increase
$ Mod = $ _ Get ["Mod"]: $ _ Get ["Mod"]: $ _ post ["Mod"];
// Last
$ Viewcontroller-> execute ($ key );
}
Catch (exception $ E)
{
// How to handle exceptions is yours
}