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    /**
     * function: ½aѹzip ¸ñʽµÄÎļþ
     * author£ºfriker
     * date:2015-15-14
     * reference£ºhttp://php.net/manual/zh/ref.zip.php
     * all rights reserved:wujiangwei123@126.com
     */
    class Unzip{
      public function __construct(){
        //init code here...
        header("content-type:text/html;charset=utf8");
      }
      /**
      * ½aѹÎļþµ½Ö¸¶¨Ä¿Â¼
      *
      * @param  string  zipѹËoÎļþµÄÂ*¾¶
      * @param  string  ½aѹÎļþµÄÄ¿µÄÂ*¾¶
      * @param  boolean ÊÇ*ñÒÔѹËoÎļþµÄÃu×Ö´´½¨Ä¿±eÎļþ¼Ð
      * @param  boolean ÊÇ*ñÖØдÒѾ­´aeÔÚµÄÎļþ
      *
      * @return boolean *µ»Ø³É¹¦ »oʧ°Ü
      */
      public function unzip($src_file, $dest_dir=false, $create_zip_name_dir=true, $overwrite=true){
      if ($zip = zip_open($src_file)){
        if ($zip){
          $splitter = ($create_zip_name_dir === true) ? "." : "/";
          if($dest_dir === false){
            $dest_dir = substr($src_file, 0, strrpos($src_file, $splitter))."/";
          }
          // Èç¹u²»´aeÔÚ ´´½¨Ä¿±e½aѹĿ¼
          $this->create_dirs($dest_dir);
           // ¶Ôÿ¸oÎļþ½øÐнaѹ
           while ($zip_entry = zip_read($zip)){
              // Îļþ²»ÔÚ¸uĿ¼
              $pos_last_slash = strrpos(zip_entry_name($zip_entry), "/");
              if ($pos_last_slash !== false){
                // ´´½¨Ä¿Â¼ ÔÚÄ(C)β´ø /
                $this->create_dirs($dest_dir.substr(zip_entry_name($zip_entry), 0, $pos_last_slash+1));
              }
              // ´o¿ª°u
              if (zip_entry_open($zip,$zip_entry,"r")){
                // ÎļþÃu±£´aeÔÚ´ÅÅÌÉÏ
                $file_name = $dest_dir.zip_entry_name($zip_entry);
                // ¼i²eÎļþÊÇ*ñÐeÒªÖØд
                if ($overwrite === true || $overwrite === false && !is_file($file_name)){
                  // ¶ÁȡѹËoÎļþµÄÄÚÈÝ
                  $fstream = zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
                  @file_put_contents($file_name, $fstream);
                  // ÉeÖÃȨÏÞ
                  chmod($file_name, 0777);
                  echo "save: ".$file_name."<br />";
                }
                // ¹Ø±ÕÈe¿Ú
                zip_entry_close($zip_entry);
              }
            }
            // ¹Ø±ÕѹËo°u
            zip_close($zip);
          }
        }else{
          return false;
        }
        return true;
      }
      /**
      * ´´½¨Ä¿Â¼
      */
      public function create_dirs($path){
       if (!is_dir($path)){
         $directory_path = "";
         $directories = explode("/",$path);
         array_pop($directories);
         foreach($directories as $directory){
           $directory_path .= $directory."/";
           if (!is_dir($directory_path)){
             mkdir($directory_path);
             chmod($directory_path, 0777);
           }
         }
       }
      }
    }
    /*
     using:
     $z = new Unzip();
     $z->unzip("./bootstrap-3.3.4.zip",'./unzipres/', true, false);
    */

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