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PHP 事件驱动程序

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May 26, 2016 am 08:18 AM

1.class.Dispatcher.php

<?php
session_start();
require_once(&#39;class.Handler_Event.php&#39;);
header("Content-type:text/html; charset=utf-8");
 
class Dispatcher{
    private $handle;
     
    function __construct($event_handle){
        $this->handle=$event_handle;
    }
     
    function handle_the_event(){
        $name="handler_$this->handle";
        if(class_exists("$name")){
            $handler_obj=new $name($this->handle);
            $response=$handler_obj->secure_handler();
            return $response;
        }else{
            echo "I can&#39;t handle this!";
        }
    }
}
?>
<html>
<head><title>Secure,Event Driven Record Viewer!</title></head>
 
<body>
<form action="<? echo $_SERVER[&#39;PHP_SELF&#39;] ?>" method="post">
   <input type="submit" name="event" value="View">
   <input type="submit" name="event" value="Edit">
</form>
</body>
</html>
<?php
function handle(){
    $event=$_POST[&#39;event&#39;];
    $do=new Dispatcher($event);
    $do->handle_the_event();
}
 
$_SESSION[&#39;name&#39;]="Wangzy";
 
if(isset($_POST[&#39;event&#39;])) handle();
?>

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2.class.Handler_Event.php

<?php
//Event parent
abstract class Event_Handler{
    function dbconn(){
        $link_id=mysql_connect("localhost","root","root");
        mysql_select_db("mytest",$link_id);
        mysql_query("set names utf8",$link_id);
        return $link_id;
    }
     
    abstract function handled_event();
    abstract function secure_handler();
}
 
//View Event
class Handler_View extends Event_Handler{
    private $handle;
     
    function __construct($event_handle){
        $this->handle=$event_handle;
    }
     
    function handled_event(){
        echo "The event, $this->handle, is now handled.<br>
        It is ,I promise!<br><br>
        Your records are as follows:<br><br>";
         
        $id=parent::dbconn();
        $result=mysql_query("select * from table01",$id);
        while($row=mysql_fetch_array($result)){
            echo "Numbers:".$row[&#39;number&#39;]."\tName:".$row[&#39;name&#39;]."<br>";
        }
    }
     
    function secure_handler(){
        if($_SESSION[&#39;name&#39;]=="Wangzy"){
            $this->handled_event();
        }else{
            echo "Sorry {$_SESSION[&#39;name&#39;]} you are not authorized!";
        }
    }
}
 
//Edit Event
class Handler_Edit extends Event_Handler{
    private $handle;
     
    function __construct($event_handle){
        $this->handle=$event_handle;
    }
     
    function handled_event(){
        echo "This is event $this->handle, which is now handled -no kidding!<br>";
    }
     
    function secure_handler(){
        $this->handled_event();
    }
}

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