php中zip压缩包的操作类

<?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) == '/' ? substr($folder, 0, strlen($folder)-1) : $folder;
        if(strstr($folder, '/')) {
            $this->root = substr($folder, 0, strrpos($folder, '/')+1);
            $folder = substr($folder, strrpos($folder, '/')+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.'/');
                    }else {
                        $this->zip->addFile($full_path.'/'.$filename, $zip_path.'/'.$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('/\/$/i', $numfiles))
                {
                    $file_dir_list[] = $numfiles;
                }
                else
                {
                    $file_list[] = $numfiles;
                }
            }
        }

        return array('files'=>$file_list, 'dirs'=>$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;
    }
}