php压缩文件帮助类

        /*
    File name: /include/zip.php
    Author: Horace 2009/04/15
    */
    class PHPZip{
    var $dirInfo = array("0","0");
    var $rootDir = '';
    var $datasec = array();
    var $ctrl_dir = array();
    var $eof_ctrl_dir = "/x50/x4b/x05/x06/x00/x00/x00/x00";
    var $old_offset = 0;
    function downloadZip(){
    createZip($dir, $zipfilename, true);
    }
    function createZip($dir, $zipfilename, $autoDownload = false){
    if (@function_exists('gzcompress')){
    @set_time_limit("0");
    if (is_array($dir)){
    $fd = fopen ($dir, "r");

    $fileValue = fread ($fd, filesize ($filename));
    fclose ($fd);
    if (is_array($dir)) $filename = basename($dir);
    $this -> addFile($fileValue, "$filename");
    }else{
    $this->dirTree($dir,$dir);
    }
    $zipfilenametemp = time().$zipfilename;
    $out = $this -> filezip();
    $fp = fopen($zipfilenametemp, "w");
    fwrite($fp, $out, strlen($out));
    fclose($fp);
    $filesize = filesize($zipfilenametemp);
    if ($filesize     if($autoDownload){
    header("Content-type: application/octet-stream");
    header("Content-disposition: attachment; filename=".$zipfilename);
    }
    echo $this -> filezip();
    }else{
    echo "create zip error!";
    }
    unlink($zipfilenametemp);
    }
    }
    //get dir tree..
    function dirTree($directory,$rootDir){
    global $_SERVER,$dirInfo,$rootDir;
    $fileDir=$rootDir;
    $myDir=dir($directory);
    while($file=$myDir->read()){


    if(is_dir("$directory/$file") and $file!="." and $file!=".."){
    $dirInfo[0]++;
    $rootDir ="$fileDir$file/";
    $this -> addFile('', "$rootDir");
    //go on n's folders
    $this->dirTree("$directory/$file",$rootDir);
    }else{
    if($file!="." and $file!=".."){
    $dirInfo[1]++;
    //$fd = fopen ("$directory/$file", "r");
    $fileValue = file_get_contents("$directory/$file");
    //fclose ($fd);
    $this -> addFile($fileValue, "$fileDir$file");
    }
    }
    }
    $myDir->close();
    }
    function unix2DosTime($unixtime = 0) {
    $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
    if ($timearray['year']     $timearray['year'] = 1980;
    $timearray['mon'] = 1;
    $timearray['mday'] = 1;
    $timearray['hours'] = 0;
    $timearray['minutes'] = 0;
    $timearray['seconds'] = 0;


    } // end if
    return (($timearray['year'] - 1980)     ($timearray['hours'] > 1);
    }
    function addFile($data, $name, $time = 0){
    $name = str_replace('//', '/', $name);
    $dtime = dechex($this->unix2DosTime($time));
    $hexdtime = '/x' . $dtime[6] . $dtime[7]
    . '/x' . $dtime[4] . $dtime[5]
    . '/x' . $dtime[2] . $dtime[3]
    . '/x' . $dtime[0] . $dtime[1];
    eval('$hexdtime = "' . $hexdtime . '";');
    $fr = "/x50/x4b/x03/x04";
    $fr .= "/x14/x00"; // ver needed to extract
    $fr .= "/x00/x00"; // gen purpose bit flag
    $fr .= "/x08/x00"; // compression method
    $fr .= $hexdtime; // last mod time and date
    // "local file header" segment
    $unc_len = strlen($data);
    $crc = crc32($data);
    $zdata = gzcompress($data);


    $c_len = strlen($zdata);
    $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
    $fr .= pack('V', $crc); // crc32
    $fr .= pack('V', $c_len); // compressed filesize
    $fr .= pack('V', $unc_len); // uncompressed filesize
    $fr .= pack('v', strlen($name)); // length of filename
    $fr .= pack('v', 0); // extra field length
    $fr .= $name;
    // "file data" segment
    $fr .= $zdata;
    // "data descriptor" segment (optional but necessary if archive is not
    // served as file)
    $fr .= pack('V', $crc); // crc32
    $fr .= pack('V', $c_len); // compressed filesize
    $fr .= pack('V', $unc_len); // uncompressed filesize
    // add this entry to array
    $this -> datasec[] = $fr;
    $new_offset = strlen(implode('', $this->datasec));
    // now add to central directory record
    $cdrec = "/x50/x4b/x01/x02";
    $cdrec .= "/x00/x00"; // version made by
    $cdrec .= "/x14/x00"; // version needed to extract


    $cdrec .= "/x00/x00"; // gen purpose bit flag
    $cdrec .= "/x08/x00"; // compression method
    $cdrec .= $hexdtime; // last mod time & date
    $cdrec .= pack('V', $crc); // crc32
    $cdrec .= pack('V', $c_len); // compressed filesize
    $cdrec .= pack('V', $unc_len); // uncompressed filesize
    $cdrec .= pack('v', strlen($name) ); // length of filename
    $cdrec .= pack('v', 0 ); // extra field length
    $cdrec .= pack('v', 0 ); // file comment length
    $cdrec .= pack('v', 0 ); // disk number start
    $cdrec .= pack('v', 0 ); // internal file attributes
    $cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
    $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
    $this -> old_offset = $new_offset;
    $cdrec .= $name;
    // optional extra field, file comment goes here
    // save to central directory
    $this -> ctrl_dir[] = $cdrec;
    }
    function filezip(){
    $data = implode('', $this -> datasec);
    $ctrldir = implode('', $this -> ctrl_dir);
    return
    $data .
    $ctrldir .
    $this -> eof_ctrl_dir .
    pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk"
    pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall
    pack('V', strlen($ctrldir)) . // size of central dir
    pack('V', strlen($data)) . // offset to start of central dir
    "/x00/x00"; // .zip file comment length
    }
    }
    ?>



还有另外一个比较简单的

[php] view plaincopy


    class createzip
    {
    /*  @creates a compressed zip file  将多个文件压缩成一个zip文件的函数
    *   @$files 数组类型  实例array("1.jpg","2.jpg");
    *   @destination  目标文件的路径  如"c:/androidyue.zip"
    *   @$overwrite 是否为覆盖与目标文件相同的文件
    *   @Recorded By Androidyue
    *   @Blog:http://thinkblog.sinaapp.com
     */
    function create_zip($files = array(),$destination = '',$overwrite = false)
    {
        //如果zip文件已经存在并且设置为不重写返回false
        if(file_exists($destination) && !$overwrite) { return false; }
        $valid_files = array();
        //if files were passed in...
        //获取到真实有效的文件名
        if(is_array($files)) {
            //cycle through each file
            foreach($files as $file) {
            //make sure the file exists
                if(file_exists($file)) {
                $valid_files[] = $file;
                }
            }
        }
        //如果存在真实有效的文件
        if(count($valid_files))
        {
            //create the archive
            $zip = new ZipArchive();
            //打开文件       如果文件已经存在则覆盖，如果没有则创建
            if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
                return false;
            }
            //向压缩文件中添加文件
            foreach($valid_files as $file) {
                $zip->addFile($file,$file);
            }
            //关闭文件
            $zip->close();
            //检测文件是否存在
            return file_exists($destination);
        }
        else{
            //如果没有真实有效的文件返回false
            return false;
        }
    }

    }
    /****
    //测试函数
    $files=array('temp.php','test.php');
    create_zip($files, 'myzipfile.zip', true);
    ****/
    ?>

压缩文件, php