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Homephp教程php手册一个用session传递对象的典型例子,和用面向对象编程的朋友共同分享(转自CSDN)

session|编程|对象

首先,你的session要好使,PHP4.1以上的版本别忘了把php.ini中的register_globle=Off设成register_globle=On,还有就是session.cookie_path = /,注意这行不可以乱改,有的版本PHP改了这个设置session就不好使,这是PHP的一个BUG.
好了,我假设你的session已经没问题了,我对下面的例子作个说明:b.php和a.php各定义了一个类,其中a.php中的类a稍微复杂,因为它是由b.php中的类doc组成的,这叫类的组成关系.我举的例子大概是最简单的类组成关系的例子啦.
c.php中产生了一个类a的对象叫test,并把它注册成session变量,c.php还显示了一个超文本的表单界面,供你输入一个字串.点击按钮后,对象test被传递到d.php,在下面的程序中,我具体介绍了传递对象时要注意的事项.这个程序是可以实际运行的,它是我学习用session传递对象的一个小总结,大家可以回去试试看,祝大家愉快.

//a.php
include("b.php");//包含b.php是因为doc类的定义在b.php中,而类a中的doc属性是doc类的对象
/**
* Short description.
* 一个带有组成关系的类
* Detail description
* @author       
* @version      1.0
* @copyright    
* @access       public
*/
class a
{
    
       /**
     * Description 这是一个简单变量作为类a的属性
     * @var       
     * @since     1.0
     * @access    private
     */
    var $docid;
    
    /**
     * Description 这是一个对象变量作为类a的属性
     * @var       
     * @since     1.0
     * @access    private
     */
    var $doc;
    
    
    /**
     * Short description.
     * 构造函数
     * Detail description
     * @param      none
     * @global     none
     * @since      1.0
     * @access     private
     * @return     void
     * @update     date time
    */
    function a()//类a的构造函数,它给自己的doc属性赋了初值
    {
        $adoc=new doc;
        $this->doc=$adoc;
    } // end func
    /**
     * Short description.
     * 给docid赋值
     * Detail description
     * @param      none
     * @global     none
     * @since      1.0
     * @access     private
     * @return     void
     * @update     date time
    */
    function getdocid()//这个函数给自己的docid属性赋了值
    {
        $this->docid=$this->doc->id;
    } // end func
    
    /**
     * Short description.
     * 这个函数极简单,就不解释啦
     * Detail description
     * @param      none
     * @global     none
     * @since      1.0
     * @access     private
     * @return     void
     * @update     date time
    */
    function printdocid()//显示doc对象属性的id属性
    {
           echo "doc->id=".$this->doc->id."
";
        
    } // end func

} // end class
?>

//b.php
/**
* Short description.
* 这是一个简单的类
* Detail description
* @author       
* @version      1.0
* @copyright    
* @access       public
*/
class doc
{
    
    /**
     * Description 简单变量作为类doc的属性
     * @var       
     * @since     1.0
     * @access    private
     */
    var $id;
    
    
    
    /**
     * Short description.
     * 这个函数显示一个录入界面
     * Detail description
     * @param      none
     * @global     none
     * @since      1.0
     * @access     private
     * @return     void
     * @update     date time
    */
    function scr()
    {
      screen();  
    } // end func
    /**
     * Short description.
     * 这个函数把上面录入的值入库
     * Detail description
     * @param      none
     * @global     none
     * @since      1.0
     * @access     private
     * @return     void
     * @update     date time
    */
    function save($conn,$i)
    {
        $sql="INSERT INTO `test` (`id`, `name`) VALUES ('', '$i')";
        $result=mysql_query($sql,$conn);
        $this->id = mysql_insert_id($conn);
    } // end func
} // end class
?>
//c.php
include("a.php");//要产生类a的对象须包含定义类a的文件(注意,a.php中不能有超文本,一个空格都不行,因为session_start前面有这样的要求;也不能包含带有超文本的文件,如果功能要求中必须包含超文本,请做成象下面screen.php那样的函数)
$test=new a();//产生一个类a的对象,取名test
session_start();
session_register('test');//把对象变量注册成session变量以便传递
include("screen.php");//这时再包含带有超文本的文件
$test->doc->scr();//调用界面显示

?>
//d.php
include("a.php");//要想用session接受前面传递的对象变量,必须在session_start()前包含定义该类的文件
session_start();
include("conn.php");//此文件中定义了下句用到的connect()函数的定义
$conn=connect();
echo "i=$i
";
$test->doc->save($conn,$i);//这个test对象是在c.php中建立,并通过session传递过来的,它是这段程序显示的目的所在, 请注意体会;test对象的属性和方法被session传递后,依然有效
$test->getdocid();
$test->printdocid();
?>


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