Introduction to PHP zip compression package operation class

<?php
/**
 * Zip 文件包工具
 *
 * @author wengxianhu
 * @date 2013-08-05
 */
class ZipFolder
{
  protected $zip;
  protected $root;
  protected $ignored_names;
  public function __construct(){
    $this->zip = new ZipArchive;
  }
  /**
   * 解压zip文件到指定文件夹
   *
   * @access public
   * @param string $zipfile 压缩文件路径
   * @param string $path  压缩包解压到的目标路径
   * @return booleam 解压成功返回 true 否则返回 false
  */
  public function unzip ($zipfile, $path) {
    if ($this->zip->open($zipfile) === true) {
      $file_tmp = @fopen($zipfile, "rb");
      $bin = fread($file_tmp, 15); //只读15字节 各个不同文件类型，头信息不一样。
      fclose($file_tmp);
      /* 只针对zip的压缩包进行处理 */
      if (true === $this->getTypeList($bin))
      {
        $result = $this->zip->extractTo($path);
        $this->zip->close();
        return $result;
      }
      else
      {
        return false;
      }
    }
    return false;
  }
  /**
   * 创建压缩文件
   *
   * @access public
   * @param string $zipfile 将要生成的压缩文件路径
   * @param strng $folder 将要被压缩的文件夹路径
   * @param array $ignored 要忽略的文件列表
   * @return booleam 压缩包生成成功返回true 否则返回 false
  */
   public function zip ($zipfile, $folder, $ignored = null) {
    $this->ignored_names = is_array($ignored) ? $ignored : $ignored ? array($ignored) : array();
    if ($this->zip->open($zipfile, ZIPARCHIVE::CREATE) !== true) {
      throw new Exception("cannot open <$zipfile>\n");
    }
    $folder = substr($folder, -1) == &#39;/&#39; ? substr($folder, 0, strlen($folder)-1) : $folder;
    if(strstr($folder, &#39;/&#39;)) {
      $this->root = substr($folder, 0, strrpos($folder, &#39;/&#39;)+1);
      $folder = substr($folder, strrpos($folder, &#39;/&#39;)+1);
    }
    $this->createZip($folder);
    return $this->zip->close();
  }
  /**
   * 递归添加文件到压缩包
   *
   * @access private
   * @param string $folder 添加到压缩包的文件夹路径
   * @param string $parent 添加到压缩包的文件夹上级路径
   * @return void
  */
  private function createZip ($folder, $parent=null) {
    $full_path = $this->root . $parent . $folder;
    $zip_path = $parent . $folder;
    $this->zip->addEmptyDir($zip_path);
    $dir = new DirectoryIterator($full_path);
    foreach($dir as $file) {
      if(!$file->isDot()) {
        $filename = $file->getFilename();
        if(!in_array($filename, $this->ignored_names)) {
          if($file->isDir()) {
            $this->createZip($filename, $zip_path.&#39;/&#39;);
          }else {
            $this->zip->addFile($full_path.&#39;/&#39;.$filename, $zip_path.&#39;/&#39;.$filename);
          }
        }
      }
    }
  }
  /**
   * 读取压缩包文件与目录列表
   *
   * @access public
   * @param string $zipfile 压缩包文件
   * @return array 文件与目录列表
  */
  public function fileList($zipfile) {
    $file_dir_list = array();
    $file_list = array();
    if ($this->zip->open($zipfile) == true) {
      for ($i = 0; $i < $this->zip->numFiles; $i++) {
        $numfiles = $this->zip->getNameIndex($i);
        if (preg_match(&#39;/\/$/i&#39;, $numfiles))
        {
          $file_dir_list[] = $numfiles;
        }
        else
        {
          $file_list[] = $numfiles;
        }
      }
    }
    return array(&#39;files&#39;=>$file_list, &#39;dirs&#39;=>$file_dir_list);
  }
  /**
  * 得到文件头与文件类型映射表
  *
  * @author wengxianhu
  * @date 2013-08-10
  * @param $bin string 文件的二进制前一段字符
  * @return boolean
  */
  private function getTypeList ($bin)
  {
    $array = array(
      array("504B0304", "zip")
    );
    foreach ($array as $v)
    {
      $blen = strlen(pack("H*", $v[0])); //得到文件头标记字节数
      $tbin = substr($bin, 0, intval($blen)); ///需要比较文件头长度
      if(strtolower($v[0]) == strtolower(array_shift(unpack("H*", $tbin))))
      {
        return true;
      }
    }
    return false;
  }
}