php实现的Cookies操作类实例

本文实例讲述了PHP实现的cookies操作类及其用法，分享给大家供大家参考。具体分析如下：

一、功能：

1.保存，读取，更新，清除cookies数据。
2.可设置前缀。
3.强制超时控制。
4.cookies数据可以是字符串，数组，对象等。

二、用法：

cookies.class.php类文件如下：

_prefix = $prefix; 
    } 
 
    if(is_numeric($expire) && $expire>0){ 
      $this->_expire = $expire; 
    } 
 
    if(is_string($securekey) && $securekey!=''){ 
      $this->_securekey = $securekey; 
    } 
 
  } 
 
   
  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); 
    } 
 
  } 
 
   
  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; 
    } 
 
  } 
 
   
  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; 
  } 
 
   
  public function clear($name){ 
 
    $cookie_name = $this->getName($name); 
    setcookie($cookie_name); 
  } 
 
   
  public function setPrefix($prefix){ 
 
    if(is_string($prefix) && $prefix!=''){ 
      $this->_prefix = $prefix; 
    } 
  } 
 
   
  public function setExpire($expire){ 
 
    if(is_numeric($expire) && $expire>0){ 
      $this->_expire = $expire; 
    } 
  } 
 
   
  private function getName($name){ 
    return $this->_prefix? $this->_prefix.'_'.$name : $name; 
  } 
 
   
  private function pack($data, $expire){ 
 
    if($data===''){ 
      return ''; 
    } 
 
    $cookie_data = array(); 
    $cookie_data['value'] = $data; 
    $cookie_data['expire'] = $expire; 
    return json_encode($cookie_data); 
  } 
 
   
  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); 
  } 
 
   
  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 
 
?> 

demo.php示例程序如下：

 'fdipzone', 
      'gender' => 'male' 
    ); 
    $obj->set('me', $data, 5); 
    echo 'set cookies'; 
    break; 
 
  case 'get': // 读取 
    $result = $obj->get('me'); 
 
    echo '
'; 
    print_r($result); 
    echo '
'; 
 
    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; 
}
?>

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希望本文所述对大家的PHP程序设计有所帮助。