Detailed explanation of the function example of php using cookies to set the user to automatically log out after 30 minutes of inactivity

This article mainly introduces PHP's use of cookies to set the automatic exit function for users who have not operated for 30 minutes. Friends who need it can refer to the following

What the login controller needs to do to successfully log in and store the user ID and other information in cookies ：

$this->systemSetKey(array(‘name‘=>$admin_info[‘admin_name‘], ‘id‘=>$admin_info[‘admin_id‘],‘gid‘=>$admin_info[‘admin_gid‘],‘sp‘=>$admin_info[‘admin_is_super‘]));//登陆成功之后做得事情

systemSetKey method in parent class:

 /**
   * 系统后台 会员登录后 将会员验证内容写入对应cookie中
   *
   * @param string $name 用户名
   * @param int $id 用户ID
   * @return bool 布尔类型的返回结果
   */
  protected final function systemSetKey($user){
    setNcCookie(‘sys_key‘,encrypt(serialize($user),MD5_KEY),3600,‘‘,null);//设置cookie 过期时间为30分钟。这边设置cookie框架有带自己加密规则，具体是否需要加密自己看着设置。
  }

Parent class controllerConstruction methodDetermine whether the user is logged in:

protected function construct(){
    Language::read(‘common,layout‘);
    /**
     * 验证用户是否登录
     * $admin_info 管理员资料 name id
     */
    $this->admin_info = $this->systemLogin();//取得管理员的资料，之后的子类控制器继承构造方法
    if ($this->admin_info[‘id‘] != 1){
      // 验证权限
      $this->checkPermission();
    }
    //转码 防止GBK下用ajax调用时传汉字数据出现乱码
    if (($_GET[‘branch‘]!=‘‘ || $_GET[‘op‘]==‘ajax‘) && strtoupper(CHARSET) == ‘GBK‘){
      $_GET = Language::getGBK($_GET);
    }
  }
  /**
   * 系统后台登录验证
   *
   * @param
   * @return array 数组类型的返回结果
   */
  protected final function systemLogin(){
    //取得cookie内容，解密，和系统匹配
    $user = unserialize(decrypt(cookie(‘sys_key‘),MD5_KEY));//取cookie 里面储存的信息，现在使用的框架里面自定义了cookie的加密方式
    if (!key_exists(‘gid‘,(array)$user) || !isset($user[‘sp‘]) || (empty($user[‘name‘]) || empty($user[‘id‘]))){  //假如不存在说明用户没登陆或者用户长时间未操作cookie时间过期 跳到登陆页面去
      @header(‘Location: index.php?mod=login&action=login‘);exit;
    }else {
      $this->systemSetKey($user);//如果用户有登陆的话，每一个操作都会重写刷新cookie；
    }
    return $user;
  }

Encryption function:

/**
 * 加密函数
 *
 * @param string $txt 需要加密的字符串
 * @param string $key 密钥
 * @return string 返回加密结果
 */
function encrypt($txt, $key = ‘‘){
  if (empty($txt)) return $txt;
  if (empty($key)) $key = md5(MD5_KEY);
  $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
  $ikey ="-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
  $nh1 = rand(0,64);
  $nh2 = rand(0,64);
  $nh3 = rand(0,64);
  $ch1 = $chars{$nh1};
  $ch2 = $chars{$nh2};
  $ch3 = $chars{$nh3};
  $nhnum = $nh1 + $nh2 + $nh3;
  $knum = 0;$i = 0;
  while(isset($key{$i})) $knum +=ord($key{$i++});
  $mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum%8,$knum%8 + 16);
  $txt = base64_encode(time().‘_‘.$txt);
  $txt = str_replace(array(‘+‘,‘/‘,‘=‘),array(‘-‘,‘_‘,‘.‘),$txt);
  $tmp = ‘‘;
  $j=0;$k = 0;
  $tlen = strlen($txt);
  $klen = strlen($mdKey);
  for ($i=0; $i<$tlen; $i++) {
    $k = $k == $klen ? 0 : $k;
    $j = ($nhnum+strpos($chars,$txt{$i})+ord($mdKey{$k++}))%64;
    $tmp .= $chars{$j};
  }
  $tmplen = strlen($tmp);
  $tmp = substr_replace($tmp,$ch3,$nh2 % ++$tmplen,0);
  $tmp = substr_replace($tmp,$ch2,$nh1 % ++$tmplen,0);
  $tmp = substr_replace($tmp,$ch1,$knum % ++$tmplen,0);
  return $tmp;
}

Decryption function:

/**
 * 解密函数
 *
 * @param string $txt 需要解密的字符串
 * @param string $key 密匙
 * @return string 字符串类型的返回结果
 */
function decrypt($txt, $key = ‘‘, $ttl = 0){
  if (empty($txt)) return $txt;
  if (empty($key)) $key = md5(MD5_KEY);
  $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
  $ikey ="-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
  $knum = 0;$i = 0;
  $tlen = @strlen($txt);
  while(isset($key{$i})) $knum +=ord($key{$i++});
  $ch1 = @$txt{$knum % $tlen};
  $nh1 = strpos($chars,$ch1);
  $txt = @substr_replace($txt,‘‘,$knum % $tlen--,1);
  $ch2 = @$txt{$nh1 % $tlen};
  $nh2 = @strpos($chars,$ch2);
  $txt = @substr_replace($txt,‘‘,$nh1 % $tlen--,1);
  $ch3 = @$txt{$nh2 % $tlen};
  $nh3 = @strpos($chars,$ch3);
  $txt = @substr_replace($txt,‘‘,$nh2 % $tlen--,1);
  $nhnum = $nh1 + $nh2 + $nh3;
  $mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum % 8,$knum % 8 + 16);
  $tmp = ‘‘;
  $j=0; $k = 0;
  $tlen = @strlen($txt);
  $klen = @strlen($mdKey);
  for ($i=0; $i<$tlen; $i++) {
    $k = $k == $klen ? 0 : $k;
    $j = strpos($chars,$txt{$i})-$nhnum - ord($mdKey{$k++});
    while ($j<0) $j+=64;
    $tmp .= $chars{$j};
  }
  $tmp = str_replace(array(‘-‘,‘_‘,‘.‘),array(‘+‘,‘/‘,‘=‘),$tmp);
  $tmp = trim(base64_decode($tmp));
  if (preg_match("/\d{10}_/s",substr($tmp,0,11))){
    if ($ttl > 0 && (time() - substr($tmp,0,11) > $ttl)){
      $tmp = null;
    }else{
      $tmp = substr($tmp,11);
    }
  }
  return $tmp;
}

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