php实现的Cookies操作类实例

<?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 = '';                         // cookie prefix 
  private $_securekey = 'ekOt4_Ut0f3XE-fJcpBvRFrg506jpcuJeixezgPNyALm';  // 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='', $expire=0, $securekey=''){ 
 
    if(is_string($prefix) && $prefix!=''){ 
      $this->_prefix = $prefix; 
    } 
 
    if(is_numeric($expire) && $expire>0){ 
      $this->_expire = $expire; 
    } 
 
    if(is_string($securekey) && $securekey!=''){ 
      $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, 'ENCODE', $this->_securekey); 
 
    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], 'DECODE', $this->_securekey); 
      $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], 'DECODE', $this->_securekey); 
      $old_cookie_value = $this->unpack($old_cookie_value); 
 
      if(isset($old_cookie_value[1]) && $old_cookie_vlaue[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, 'ENCODE', $this->_securekey); 
 
        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!=''){ 
      $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? $this->_prefix.'_'.$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===''){ 
      return ''; 
    } 
 
    $cookie_data = array(); 
    $cookie_data['value'] = $data; 
    $cookie_data['expire'] = $expire; 
    return json_encode($cookie_data); 
  } 
 
  /** unpack 
  * @param Mixed $data 数据 
  * @return       array(数据,过期时间) 
  */ 
  private function unpack($data){ 
 
    if($data===''){ 
      return array('', 0); 
    } 
 
    $cookie_data = json_decode($data, true); 
 
    if(isset($cookie_data['value']) && isset($cookie_data['expire'])){ 
 
      if(time()<$cookie_data['expire']){ // 未过期 
        return array($cookie_data['value'], $cookie_data['expire']); 
      } 
    } 
    return array('', 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 = 'DECODE'){ 
 
    $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 == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
 
    $cryptkey = $keya.md5($keya.$keyc); 
    $key_length = strlen($cryptkey); 
 
    $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', 0).substr(md5($string.$keyb), 0, 16).$string; 
    $string_length = strlen($string); 
 
    $result = ''; 
    $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($operation == 'DECODE') { 
      if((substr($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 ''; 
      } 
    } else { 
      return $keyc.str_replace('=', '', base64_encode($result)); 
    } 
  } 
} // class end 
 
?> 

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