A preliminary study on the PHP implementation method of MVC classic mode_PHP tutorial

　　MVC模式的php(做为现在的主流开发语言)实现
　　
　　作者:Harry Fuecks 翻译：Easy Chen
　　MVC模式在网站架构中十分常见。它允许我们建立一个三层结构的应用程式，从代码中分离出有用的层，帮助设计师和开发者协同工作以及提高我们维护和扩展既有程式的能力。
　　
　　视图（View）
　　“视图”主要指我们送到Web浏览器的最终结果——比如我们的脚本生成的HTML。当说到视图时，很多人想到的是模版，但是把模板方案叫做视图的正确性是值得怀疑的。
　　
　　对视图来说，最重要的事情可能是它应该是“自我意识（self aware）”的，视图被渲染（render）时，视图的元素能意识到自己在更大框架中的角色。
　　
　　以xml(标准化越来越近了)为例，可以说xml(标准化越来越近了)在被解析时，DOM API有着这样的认知——一个DOM树里的节点知道它在哪里和它包含了什么。 （当一个xml(标准化越来越近了)文档中的节点用SAX解析时只有当解析到该节点时它才有意义。）
　　
　　绝大多数模板方案使用简单的过程语言和这样的模板标签：
　　
　　

{some_text}

　　

{some_more_text}

　
They have no meaning in the document, they only mean that php(as the current mainstream development language)will replace it with other things.
　
If you agree with this loose description of views, you will also agree that most template solutions do not effectively separate views and models. The template tag will be replaced with whatever is stored in the model.
　
Ask yourself a few questions when you implement a view: "Is it easy to replace the entire view?" "How long does it take to implement a new view?" "Is it easy to replace the view's description language? (For example, in Replace the HTML document with a SOAP document in the same view)"
　
　Model (Model)
　The model represents the program logic. (Often called the business layer in enterprise-level programs)
　
In general, the task of the model is to convert the original data into data that contains certain meanings, which will be viewed by the view. show. Typically, the model will encapsulate data queries, perhaps through some abstract data class (data access layer) to implement the query. For example, if you wish to calculate the annual rainfall in the UK (just to find yourself a nice holiday spot), the model will receive the daily rainfall for ten years, calculate the average, and pass it to the view.
　
　Controller (controller)
　 Simply put, the controller is the first part called by the incoming HTTP request in the web application. It checks the received request, such as some GET variables, and makes appropriate feedback. Before writing your first controller, it is difficult for you to start writing other PHP (as the current mainstream development language) code. The most common usage is the structure like switch statement in index.php(as the current mainstream development language):
　
　(as the current mainstream development language) )
switch ($_GET[viewpage]) {
case "news":
$page=new NewsRenderer;
break;
case "links":
$ page=new LinksRenderer;
break;
default:
$page=new HomePageRenderer;
break; ;
　
This code mixes procedural and object-oriented code, but for small sites, this is usually the best choice. Although the above code can still be optimized.
　
　 Controllers are actually controls used to trigger bindings between model data and view elements.
　
　
Example

　Here is a simple example using the MVC pattern. First we need a database access class, which is a common class. 　
　(as the current mainstream development language)

　/** * A simple class for querying MySQL (The best combination with PHP)

*/ class Dataaccess(a favorite for small websites)
{
/**　　* Private 　　* $db stores a database resource
　　*/
var $db;
/**
　　* Private
　　* $query stores a query resource
　　*/
var $query; // Query resource

//! A constructor.
　/**
　　* Constucts a new Dataaccess
(小型网站之最爱)
object
　　* @param $host string hostname for dbserver 　　* @param $user string dbserver user 　　* @param $pass string dbserver user password
　　* @param $db string database name
　　*/
　function Dataaccess
(favorite for small websites)
($host,$user,$pass,$db) {
　$this->db=MySQL(The best combination with PHP)_pconnect($host,$user,$pass);
MySQL(The best combination with PHP Best combination)_select_db($db,$this->db);
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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/509143.htmlTechArticleMVC pattern PHP (as the current mainstream development language) Implementation author: Harry Fuecks Translation: Easy Chen MVC pattern Very common in website architecture. It allows us to build a three-tier structure...