Introduction to php Cookies operation class

<?php
/** Cookies class 保存,读取,更新,清除cookies数据。可设置前缀。强制超时。数据可以是字符串,数组,对象等。
*   Date:   2013-12-22
*   Author: fdipzone
*   Ver:    1.0
*   Func:
*   public   set        设置cookie
*   public   get        读取cookie
*   public   update     更新cookie
*   public   clear      清除cookie
*   public   setPrefix  设置前缀
*   public   setExpire  设置过期时间
*   private  authcode   加密/解密
*   private  pack       将数据打包
*   private  unpack     将数据解包
*   private  getName    获取cookie name,增加prefix处理
*/
class Cookies{ // class start
    private $_prefix = &#39;&#39;;                                                  // cookie prefix
    private $_securekey = &#39;ekOt4_Ut0f3XE-fJcpBvRFrg506jpcuJeixezgPNyALm&#39;;   // encrypt key
    private $_expire = 3600;                                                // default expire
    /** 初始化
    * @param String $prefix     cookie prefix
    * @param int    $expire     过期时间
    * @param String $securekey  cookie secure key
    */
    public function __construct($prefix=&#39;&#39;, $expire=0, $securekey=&#39;&#39;){
        if(is_string($prefix) && $prefix!=&#39;&#39;){
            $this->_prefix = $prefix;
        }
        if(is_numeric($expire) && $expire>0){
            $this->_expire = $expire;
        }
        if(is_string($securekey) && $securekey!=&#39;&#39;){
            $this->_securekey = $securekey;
        }
    }
    /** 设置cookie
    * @param String $name   cookie name
    * @param mixed  $value  cookie value 可以是字符串,数组,对象等
    * @param int    $expire 过期时间
    */
    public function set($name, $value, $expire=0){
        $cookie_name = $this->getName($name);
        $cookie_expire = time() + ($expire? $expire : $this->_expire);
        $cookie_value = $this->pack($value, $cookie_expire);
        $cookie_value = $this->authcode($cookie_value, &#39;ENCODE&#39;);
        if($cookie_name && $cookie_value && $cookie_expire){
            setcookie($cookie_name, $cookie_value, $cookie_expire);
        }
    }
    /** 读取cookie
    * @param  String $name   cookie name
    * @return mixed          cookie value
    */
    public function get($name){
        $cookie_name = $this->getName($name);
        if(isset($_COOKIE[$cookie_name])){
            $cookie_value = $this->authcode($_COOKIE[$cookie_name], &#39;DECODE&#39;);
            $cookie_value = $this->unpack($cookie_value);
            return isset($cookie_value[0])? $cookie_value[0] : null;
        }else{
            return null;
        }
    }
    /** 更新cookie,只更新内容,如需要更新过期时间请使用set方法
    * @param  String $name   cookie name
    * @param  mixed  $value  cookie value
    * @return boolean
    */
    public function update($name, $value){
        $cookie_name = $this->getName($name);
        if(isset($_COOKIE[$cookie_name])){
            $old_cookie_value = $this->authcode($_COOKIE[$cookie_name], &#39;DECODE&#39;);
            $old_cookie_value = $this->unpack($old_cookie_value);
            if(isset($old_cookie_value[1]) && $old_cookie_value[1]>0){ // 获取之前的过期时间
                $cookie_expire = $old_cookie_value[1];
                // 更新数据
                $cookie_value = $this->pack($value, $cookie_expire);
                $cookie_value = $this->authcode($cookie_value, &#39;ENCODE&#39;);
                if($cookie_name && $cookie_value && $cookie_expire){
                    setcookie($cookie_name, $cookie_value, $cookie_expire);
                    return true;
                }
            }
        }
        return false;
    }
    /** 清除cookie
    * @param  String $name   cookie name
    */
    public function clear($name){
        $cookie_name = $this->getName($name);
        setcookie($cookie_name);
    }
    /** 设置前缀
    * @param String $prefix cookie prefix
    */
    public function setPrefix($prefix){
        if(is_string($prefix) && $prefix!=&#39;&#39;){
            $this->_prefix = $prefix;
        }
    }
    /** 设置过期时间
    * @param int $expire cookie expire
    */
    public function setExpire($expire){
        if(is_numeric($expire) && $expire>0){
            $this->_expire = $expire;
        }
    }
    /** 获取cookie name
    * @param  String $name
    * @return String
    */
    private function getName($name){
        return $this->_prefix? $this->_prefix.&#39;_&#39;.$name : $name;
    }
    /** pack
    * @param  Mixed  $data      数据
    * @param  int    $expire    过期时间 用于判断
    * @return
    */
    private function pack($data, $expire){
        if($data===&#39;&#39;){
            return &#39;&#39;;
        }
        $cookie_data = array();
        $cookie_data[&#39;value&#39;] = $data;
        $cookie_data[&#39;expire&#39;] = $expire;
        return json_encode($cookie_data);
    }
    /** unpack
    * @param  Mixed  $data 数据
    * @return              array(数据,过期时间)
    */
    private function unpack($data){
        if($data===&#39;&#39;){
            return array(&#39;&#39;, 0);
        }
        $cookie_data = json_decode($data, true);
        if(isset($cookie_data[&#39;value&#39;]) && isset($cookie_data[&#39;expire&#39;])){
            if(time()<$cookie_data[&#39;expire&#39;]){ // 未过期
                return array($cookie_data[&#39;value&#39;], $cookie_data[&#39;expire&#39;]);
            }
        }
        return array(&#39;&#39;, 0);
    }
    /** 加密/解密数据
    * @param  String $str       原文或密文
    * @param  String $operation ENCODE or DECODE
    * @return String            根据设置返回明文活密文
    */
    private function authcode($string, $operation = &#39;DECODE&#39;){
        $ckey_length = 4;   // 随机密钥长度 取值 0-32;
        $key = $this->_securekey;
        $key = md5($key);
        $keya = md5(substr($key, 0, 16));
        $keyb = md5(substr($key, 16, 16));
        $keyc = $ckey_length ? ($operation == &#39;DECODE&#39; ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : &#39;&#39;;
        $cryptkey = $keya.md5($keya.$keyc);
        $key_length = strlen($cryptkey);
        $string = $operation == &#39;DECODE&#39; ? base64_decode(substr($string, $ckey_length)) : sprintf(&#39;%010d&#39;, 0).substr(md5($string.$keyb), 0, 16).$string;
        $string_length = strlen($string);
        $result = &#39;&#39;;
        $box = range(0, 255);
        $rndkey = array();
        for($i = 0; $i <= 255; $i++) {
            $rndkey[$i] = ord($cryptkey[$i % $key_length]);
        }
        for($j = $i = 0; $i < 256; $i++) {
            $j = ($j + $box[$i] + $rndkey[$i]) % 256;
            $tmp = $box[$i];
            $box[$i] = $box[$j];
            $box[$j] = $tmp;
        }
        for($a = $j = $i = 0; $i < $string_length; $i++) {
            $a = ($a + 1) % 256;
            $j = ($j + $box[$a]) % 256;
            $tmp = $box[$a];
            $box[$a] = $box[$j];
            $box[$j] = $tmp;
            $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
        }
        if($operation == &#39;DECODE&#39;) {
            if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
                return substr($result, 26);
            } else {
                return &#39;&#39;;
            }
        } else {
            return $keyc.str_replace(&#39;=&#39;, &#39;&#39;, base64_encode($result));
        }
    }
} // class end
?>

<?php
require &#39;Cookies.class.php&#39;;
$type = isset($_GET[&#39;type&#39;])? strtolower($_GET[&#39;type&#39;]) : &#39;&#39;;
if(!in_array($type, array(&#39;set&#39;,&#39;get&#39;,&#39;update&#39;,&#39;clear&#39;))){
    exit(&#39;type not exists&#39;);
}
$obj = new Cookies(&#39;member&#39;, 10); // obj
switch($type){
    case &#39;set&#39;: // 设置
        $data = array(
            &#39;name&#39; => &#39;fdipzone&#39;,
            &#39;gender&#39; => &#39;male&#39;
        );
        $obj->set(&#39;me&#39;, $data, 5);
        echo &#39;set cookies&#39;;
        break;
    case &#39;get&#39;: // 读取
        $result = $obj->get(&#39;me&#39;);
        echo &#39;<pre class="brush:php;toolbar:false">&#39;;
        print_r($result);
        echo &#39;