如何在 Codeigniter 中为用户记住 10 篇带有时间戳的最后阅读文章？

Question

我想制作一个 PHP if 条件代码，它将检查用户阅读的最后 10 篇文章或 10 分钟是否已经过去。

例如

用户打开一个 id = 235 的页面（这个 id 值在 url localhost/article/235 中）

并且这个 id 值将保存在会话中，其中包含 当前时间戳，可能还有他的 IP 地址

然后他又读了一篇文章，同样的事情也会发生。

我需要记住另外十次点击的点击内容，然后只为第一行重置。例如。第 10 次点击后，id 和时间戳不会变为第 11 行，而是会替换列表中的第 1 行。

CodeIgniter 中的 php 条件将检查这些值，并更新文章表和列计数器中的文章命中计数器值，如下所示：

   $this->db->where('id', $id);
   $this->db->set('counter', 'counter+1', FALSE);
   $this->db->update('articles');

但在调用此代码之前，我需要从会话中进行此项检查吗？

怎么做？

我认为存储例如会话中每个用户有 10 个带有时间戳的条目就足够了。

只是不要在会话中保存同一个页面两次。

条件将检查当前时间戳与保存的时间戳，是否超过例如10 分钟或用户已经阅读/点击了另外 10 篇文章，它将允许更新计数器 php 代码。

我不需要这个防弹。只是使用浏览器的刷新按钮禁用增量。

所以，如果他想增加计数器，他需要等待 10 分钟或再阅读 10 篇文章；）

Answer 1

您绝对应该参加 Sessions。它可以节省您的带宽消耗，并且更容易处理。当然，除非您需要客户端的数据，根据您的解释，我认为您不需要。假设您参加了会议，您所要做的就是将您拥有的数据存储在一个数组中。下面的代码应该做到这一点：

$aClicks = $this->session
                ->userdata('article_clicks');

// Initialize the array, if it's not already initialized
if ($aClicks == false) {
    $aClicks = array();
}

// Now, we clean our array for the articles that have been clicked longer than
// 10 minutes ago.
$aClicks = array_filter(
    $aClicks,
    function($click) {
        return (time() - $click['time']) < 600; // Less than 10 minutes elapsed
    }
);

// We check if the article clicked is already in the list
$found = false;
foreach ($aClicks as $click) {
    if ($click['article'] === $id) { // Assuming $id holds the article id
        $found = true;
        break;
    }
}

// If it's not, we add it
if (!$found) {
    $aClicks[] = array(
        'article' => $id, // Assuming $id holds the article id
        'time'    => time()
    );
}

// Store the clicks back to the session
$this->session
     ->set_userdata('article_clicks', $aClicks);


// If we meet all conditions
if (count($aClicks) < 10) {
    // Do something
}

Answer 2

我假设 $clicks 是一个包含最多十篇已访问文章的数组。 id 用作键，时间戳用作值。 $id 是新文章的id。

$clicks = $this->session->userdata('article_clicks');

//default value
$clicks = ($clicks)? $clicks : array();

//could be loaded from config
$maxItemCount = 10;
$timwToLive= 600;

//helpers
$time = time();
$deadline = $time - $timeToLive;

//add if not in list
if(! isset($clicks[$id]) ){
  $clicks[$id] = $time;
}
//remove old values
$clicks = array_filter($clicks, function($value){ $value >= $deadline;});

//sort newest to oldest
arsort($clicks);

//limit items, oldest will be removed first because we sorted the array
$clicks = array_slice($clicks, 0, $maxItemCount);

//save to session
$this->session->>set_userdata('article_clicks',$clicks)

用法：

//print how mch time has passed since the last visit
if(isset($clicks[$id]){
  echo "visited ".($time-$clicks[$id]). "seconds ago." ;
} else {
  echo "first visit";
}

编辑：您必须使用 arsort 而不是 rsort 否则密钥会丢失，抱歉

Answer 3

根据 Raphael_ 代码和您的问题，您可以试试这个：

    <?php
            $aClicks = $this->session
                ->userdata('article_clicks');
        $nextId = $this->session->userdata('nextId');
        // Initialize the array, if it's not already initialized
        if ($aClicks == false) {
            $aClicks = array();
            $nextId = 0;
        }
        // Now, we clean our array for the articles that have been clicked longer than
       // 10 minutes ago.
        $aClicks = array_filter($aClicks, function($click) {
                    return (time() - $click['time']) < 600; // Less than 10 minutes elapsed
                }
        );
// We check if the article clicked is already in the list
        $found = false;
        foreach ($aClicks as $click) {
            if ($click['article'] === $id) { // Assuming $id holds the article id
                $found = true;
                break;
            }
        }
// If it's not, we add it
        if (!$found) {
            $aClicks[$nextId] = array(
                'article' => $id, // Assuming $id holds the article id
                'time' => time()
            );
            $nextId++;
            $this->session->set_userdata('nextId', $nextId);
        }
        $this->session->set_userdata('article_clicks', $aClicks);
        if (count($aClicks) > 10 && $nextId > 9) {
            $this->session->set_userdata('nextId', 0);
            echo "OK!";

        }
    ?>

Answer 4

希望我能正确理解您的需求。

用法：

$this->load->library('click');
$this->click->add($id, time());  

类API非常简单，代码加注释。您还可以检查一个项目是否expired()，如果exists() 和您可以get() 项目节省时间。

记住：

• 每个项目将在 10 分钟后过期（请参阅 $ttl）

• 会话中仅保存 10 个项目（请参阅 $max_entries）

  class Click
  {
      /**
       * CI instance
       * @var object
       */
      private $CI;
  
      /**
       * Click data holder
       * @var array
       */
      protected $clicks = array();
  
      /**
       * Time until an entry will expire
       * @var int
       */
      protected $ttl = 600;
  
      /**
       * How much entries do we store ?
       * @var int
       */
      protected $max_entries = 10;
  
      // -------------------------------------------------------------------------
  
      public function __construct()
      {
          $this->CI =& get_instance();
  
          if (!class_exists('CI_Session')) {
              $this->CI->load->library('session');
          }
  
          // load existing data from user's session
          $this->fetch();
      }
  
      // -------------------------------------------------------------------------
  
      /**
       * Add a new page
       *
       * @access  public
       * @param   int     $id     Page ID
       * @param   int     $time   Added time (optional)
       * @return  bool
       */
      public function add($id, $time = null)
      {
          // If page ID does not exist and limit has been reached, stop here
          if (!$this->exist($id) AND (count($this->clicks) == $this->max_entries)) {
              return false;
          }
  
          $time = !is_null($time) ? $time : time();
  
          if ($this->expired($id)) {
              $this->clicks[$id] = $time;
              return true;
          }
  
          return false;
      }
  
      /**
       * Get specified page ID data
       *
       * @access  public
       * @param   int     $id     Page ID
       * @return  int|bool        Added time or `false` on error
       */
      public function get($id)
      {
          return ($this->exist($id)) ? $this->clicks[$id] : false;
      }
  
      /**
       * Check if specified page ID exists
       *
       * @access  public
       * @param   int     $id Page ID
       * @return  bool
       */
      public function exist($id)
      {
          return isset($this->clicks[$id]);
      }
  
      /**
       * Check if specified page ID expired
       *
       * @access  public
       * @param   int     $id Page ID
       * @return  bool
       */
      public function expired($id)
      {
          // id does not exist, return `true` so it can added
          if (!$this->exist($id)) {
              return true;
          }
  
          return ((time() - $this->clicks[$id]) >= $this->ttl) ? true : false;
      }
  
      /**
       * Store current clicks data in session
       *
       * @access  public
       * @return  object  Click
       */
      public function save()
      {
          $this->CI->session->set_userdata('article_clicks', serialize($this->clicks));
  
          return $this;
      }
  
      /**
       * Load data from user's session
       *
       * @access  public
       * @return  object  Click
       */
      public function fetch()
      {
          if ($data = $this->CI->session->userdata('article_clicks')) {
              $this->clicks = unserialize($data);
          }
  
          return $this;
      }
  
      public function __destruct()
      {
          $this->save();
      }
  }
  

Answer 5

您可以轻松地将其包装到它自己的类中，该类将信息序列化为字符串并能够操作数据，例如添加另一个值，同时注意最多十个元素。

一个潜在的用法可能看起来像，让我们假设 cookie last 在开始时将包含 256：

echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(10), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(20), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(30), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(40), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(50), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(60), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(70), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(80), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(90), "\n";
echo $_COOKIE['last'] = (new StringQueue($_COOKIE['last']))->add(100), "\n";

还有输出（Demo）：

10,256
20,10,256
30,20,10,256
40,30,20,10,256
50,40,30,20,10,256
60,50,40,30,20,10,256
70,60,50,40,30,20,10,256
80,70,60,50,40,30,20,10,256
90,80,70,60,50,40,30,20,10,256
100,90,80,70,60,50,40,30,20,10

一个粗略的实现：

class StringQueue implements Countable
{
    private $size = 10;
    private $separator = ',';
    private $values;

    public function __construct($string) {
        $this->values = $this->parseString($string);
    }

    private function parseString($string) {
        $values = explode($this->separator, $string, $this->size + 1);
        if (isset($values[$this->size])) {
            unset($values[$this->size]);
        }
        return $values;
    }

    public function add($value) {
        $this->values = $this->parseString($value . $this->separator . $this);
        return $this;
    }

    public function __toString() {
        return implode(',', $this->values);
    }

    public function count() {
        return count($this->values);
    }
}

这只是一些基本的字符串操作，这里是implode 和explode。