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HomeBackend DevelopmentPHP Tutorialphp针对cookie操作的队列操作类实例_PHP

本文实例讲述了php针对cookie操作的队列操作类。分享给大家供大家参考。具体分析如下:

这里包括了从简单的cookie操作(增加,删除,修改)到我们的cookie队列操作类的操作,对此感兴趣的朋友可以参考一下。

一、PHP 的COOKIE

cookie 是一种在远程浏览器端储存数据并以此来跟踪和识别用户的机制。

PHP 在http 协议的头信息里发送cookie,因此 setcookie() 函数必须在其它信息被输出到浏览器前调用,这和对  header() 函数的限制类似.

设置cookie:

可以用 setcookie()或 setrawcookie()函数来设置 cookie,也可以通过向客户端直接发送http  头来设置.

这里使用 setcookie()函数设置cookie:

代码如下:

bool setcookie ( string name [, string value [,int expire [,string path [,string domain [,bool secure [,bool httponly]]]]]] )

其中的参数:

name: cookie 变量名

value: cookie 变量的值

expire: 有效期结束的时间

path: 有效目录

domain: 有效域名,顶级域唯一

secure: 如果值为 1,则cookie 只能在https 连接上有效,如果为默认值 0,则http 和 https 都可以.

来看几个例子,简单的:

代码如下:

SetCookie("MyCookie", "Value of MyCookie");

带失效时间的.代码如下:

代码如下:

SetCookie("WithExpire", "Expire in 1 hour", time()+3600);//3600秒=1小时

什么都有的,代码如下:

代码如下:

SetCookie("FullCookie", "Full cookie value", time()+3600, "/forum", ".phpuser.com", 1);

我们需要用到队列,代码如下:

代码如下:

class QueueSvc
{/*{{{*/
    private $length; // 队列的长度
    private $server_arr;
    
    public function __construct($length,$server_arr)
    {
        $this->length = $length;
        $this->server_arr = $server_arr;
    }
    
    public function getServerArr()
    {
        return $this->server_arr;
    }
    
    public function set($server_name)
    {
        self::push($server_name);
    }
    
    private function push($server_name)
    {
        //有重复的记录,把重复的删掉
        if(self::isServerExist($server_name)){
            self::removeRepeat($server_name);
        }else{
            if(self::isFull()){
                //如果已经满了,要把队列最后一个记录删掉
                array_pop($this->server_arr);
            }
        }
        //如果队列为空,先置为空数组
        if(emptyempty($this->server_arr))
            $this->server_arr = array();
        //向队列头添加数据 
        array_unshift($this->server_arr,$server_name);  
    }
    
    private function isFull()
    {
        if(is_array($this->server_arr) && (count($this->server_arr) >= $this->length))
            return true;
        return false; 
    }
    
    private function isServerExist($server_name)
    {
        if(is_array($this->server_arr) && in_array($server_name,$this->server_arr))
            return true;
        return false;
    }
    
    private function removeRepeat($server_name)
    {
        if(is_array($this->server_arr) && in_array($server_name,$this->server_arr))
        {
            foreach($this->server_arr as $key=>$value)
            {
                if($server_name == $value)
                {
                    $this->array_remove($this->server_arr,$key);
                }
            }   
        }
    }
    
    private function array_remove(&$arr, $offset) {     
        array_splice ( $arr, $offset, 1 ); 
    }
}/*}}}*/require_once('queue_svc.php');
class CookieSvc
{/*{{{*/
    const   COOKIE_KEY = "GAME_SERVER";
    
    const   SEPARATE   = "|";
 
    const   COOKIE_LENGTH = "2";
    
    public function getCookieArr()
    {/*{{{*/
        $server_str =  $_COOKIE[self::COOKIE_KEY];
        $server_str =  $_COOKIE['GAME_SERVER'];
        if($server_str == ''){
            $result =  array();
        }else{
            $result = explode(self::SEPARATE,$server_str);
        }
        return $result;
    }/*}}}*/
    
    public function set($cookie_id)
    {/*{{{*/
        $server_arr = self::getCookieArr();
        if($cookie_id != false)
        {
            $que = new QueueSvc(self::COOKIE_LENGTH,$server_arr);
            $que->set($cookie_id);
            $server_new = $que->getServerArr();
            if(is_array($server_new))
            {
                $cookie_str = implode(self::SEPARATE,$server_new);
                setcookie(self::COOKIE_KEY,$cookie_str,time()+3600,'/');
            }
        }
    }/*}}}*/
}/*}}}*/


不多解释了,这个别人用的不多,昨天因为需要写的,留一下吧,也许以后还用得到,调用的代码很简单,代码如下:

代码如下:

require_once("queue_svc.php");
 
require_once("cookie_svc.php");
 
$cookie_id = '4';
 
CookieSvc::set($cookie_id);


这样就可以了,大家可以每次把$cookie_id换做不同的值,来检验此操作,检验的代码可以用如下代码:

代码如下:

var_dump($_COOKIE);

二、常见问题解决:

1. 用 setcookie()时有错误提示,可能是因为调用setcookie()前面有输出或空格。也可能你的文档是从其他字符集转换过来,文档后面可能带有 BOM 签名(就是在文件内容添加一些隐藏的BOM 字符),解决的办法就是使你的文档不出现这种情况,还有通过使用ob_start()函数也能处理一点.

2. $_COOKIE 受magic_quotes_gpc 影响,可能自动转义.

3. 使用的时候,有必要测试用户是否支持cookie.

希望本文所述对大家的PHP程序设计有所帮助。

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