Detailed explanation on the definition and use of redis cache class in PHP

The example of this article describes the definition and use of the redis cache class implemented by PHP. Share it with everyone for your reference, the details are as follows:

php+redis cache class

##

<?php
class redisCache {
  /**
  * $host : redis服务器ip
  * $port : redis服务器端口
  * $lifetime : 缓存文件有效期,单位为秒
  * $cacheid : 缓存文件路径,包含文件名
  */
  private $host;
  private $port;
  private $lifetime;
  private $cacheid;
  private $data;
  public $redis;
  /**
  * 析构函数,检查缓存目录是否有效,默认赋值
  */
  function __construct($lifetime=1800) {
    //配置
    $this->host = "127.0.0.1";
    $this->port = "6379";
    $redis = new Redis();
    $redis->pconnect($this->host,$this->port);
    $this->redis=$redis;
    $this->cacheid = $this->getcacheid();
    $this->lifetime = $lifetime;
    $this->data=$redis->hMGet($this->cacheid, array(&#39;content&#39;,&#39;creattime&#39;));
    //print_r($this->redis);
    //print_r($this->data);
  }
  /**
  * 检查缓存是否有效
  */
  private function isvalid(){
    $data=$this->data;
    if (!$data[&#39;content&#39;]) return false;
    if (time() - $data[&#39;creattime&#39;] > $this->lifetime) return false;
    return true;
  }
  /**
  * 写入缓存
  * $mode == 0 , 以浏览器缓存的方式取得页面内容
  */
  public function write($mode=0,$content=&#39;&#39;) {
    switch ($mode) {
      case 0:
        $content = ob_get_contents();
        break;
      default:
        break;
    }
    ob_end_flush();
    try {
      $this->redis->hMset($this->cacheid, array(&#39;content&#39;=>$content,&#39;creattime&#39;=>time()));
      $this->redis->expireAt($this->cacheid, time() + $this->lifetime);
    }
    catch (Exception $e) {
      $this->error(&#39;写入缓存失败!&#39;);
    }
  }
  /**
  * 加载缓存
  * exit() 载入缓存后终止原页面程序的执行,缓存无效则运行原页面程序生成缓存
  * ob_start() 开启浏览器缓存用于在页面结尾处取得页面内容
  */
  public function load() {
    if ($this->isvalid()) {
      echo $this->data[&#39;content&#39;];
      exit();
    }
    else {
      ob_start();
    }
  }
  /**
  * 清除缓存
  */
  public function clean() {
    try {
      $this->redis->hDel($this->cacheid, array(&#39;content&#39;,&#39;creattime&#39;));
    }
    catch (Exception $e) {
      $this->error(&#39;清除缓存失败!&#39;);
    }
  }
  /**
  * 取得缓存文件路径
  */
  private function getcacheid() {
    return $this->dir.md5($this->geturl()).$this->ext;
  }
  /**
  * 取得当前页面完整url
  */
  private function geturl() {
    $url = &#39;&#39;;
    if (isset($_SERVER[&#39;REQUEST_URI&#39;])) {
      $url = $_SERVER[&#39;REQUEST_URI&#39;];
    }
    else {
      $url = $_SERVER[&#39;Php_SELF&#39;];
      $url .= empty($_SERVER[&#39;QUERY_STRING&#39;])?&#39;&#39;:&#39;?&#39;.$_SERVER[&#39;QUERY_STRING&#39;];
    }
    return $url;
  }
  /**
  * 输出错误信息
  */
  private function error($str) {
    echo &#39;<p style="color:red;">&#39;.$str.&#39;</p>&#39;;
  }
}
//用法：
// require_once(&#39;redisCache.php&#39;);
// $cache = new redisCache(10); //设置缓存生存期
// if ($_GET[&#39;clearCache&#39;]) $cache->clean();
// else $cache->load(); //装载缓存,缓存有效则不执行以下页面代码
// //页面代码开始
// //页面代码结束
// $cache->write(); //首次运行或缓存过期,生成缓存
?>

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