php ZIP compression class example sharing

Function: Compress files into zip or rar archives. The suffix name can be customized. Usage: First instantiate, then pass parameters. Two parameters. The first one is an Array of file addresses. The second is the absolute address of the compressed package file to be saved.

How to call the php zip compression class:

$zipfiles =array("/root/pooy/test1.txt","/root/pooy/test2.txt");
$z = new PHPZip();
/ /$randomstr = random(8);
$zipfile = TEMP."/photocome_".$groupid.".zip";
$z->Zip($zipfiles, $zipfile); //Add file list

PHP’s ZIP compression class:

#
# PHPZip v1.2 by Sext (sext@neud.net) 2002-11-18
#     (Changed: 2003-03-01)
#
# Makes zip archive
#
# Based on "Zip file creation class", uses zLib
#
#
class PHPZip
{
    function Zip($dir, $zipfilename)
    {
        if (@function_exists('gzcompress'))
        {
            $curdir = getcwd();
            if (is_array($dir))
            {
                    $filelist = $dir;
            }
            else
            {
                $filelist = $this -> GetFileList($dir);
            }
            if ((!empty($dir))&&(!is_array($dir))&&(file_exists($dir))) chdir($dir);
            else chdir($curdir);
            if (count($filelist)>0)
            {
                foreach($filelist as $filename)
                {
                    if (is_file($filename))
                    {
                        $fd = fopen ($filename, "r");
                        $content = fread ($fd, filesize ($filename));
                        fclose ($fd);
                        if (is_array($dir)) $filename = basename($filename);
                        $this -> addFile($content, $filename);
                    }
                }
                $out = $this -> file();
                chdir($curdir);
                $fp = fopen($zipfilename, "w");
                fwrite($fp, $out, strlen($out));
                fclose($fp);
            }
            return 1;
        }
        else return 0;
    }
    function GetFileList($dir)
    {
        if (file_exists($dir))
        {
            $args = func_get_args();
            $pref = $args[1];
            $dh = opendir($dir);
            while($files = readdir($dh))
            {
                if (($files!=".")&&($files!=".."))
                {
                    if (is_dir($dir.$files))
                    {
                        $curdir = getcwd();
                        chdir($dir.$files);
                        $file = array_merge($file, $this -> GetFileList("", "$pref$files/"));
                        chdir($curdir);
                    }
                    else $file[]=$pref.$files;
                }
            }
            closedir($dh);
        }
        return $file;
    }
    var $datasec      = array();
    var $ctrl_dir     = array();
    var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
    var $old_offset   = 0;
    /**
     * Converts an Unix timestamp to a four byte DOS date and time format (date
     * in high two bytes, time in low two bytes allowing magnitude comparison).
     *
     * @param  integer  the current Unix timestamp
     *
     * @return integer  the current date in a four byte DOS format
     *
     * @access private
*/
    function unix2DosTime($unixtime = 0) {
        $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
        if ($timearray['year'] < 1980) {
            $timearray['year']    = 1980;
            $timearray['mon']     = 1;
            $timearray['mday']    = 1;
            $timearray['hours']   = 0;
            $timearray['minutes'] = 0;
            $timearray['seconds'] = 0;
        } // end if
        return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
                ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
    }// end of the 'unix2DosTime()' method
    /**
     * Adds "file" to archive
     *
     * @param  string   file contents
     * @param  string   name of the file in the archive (may contains the path)
     * @param  integer  the current timestamp
     *
     * @access public
*/
    function addFile($data, $name, $time = 0)
    {
        $name     = str_replace('\', '/', $name);
        $dtime    = dechex($this->unix2DosTime($time));
        $hexdtime = 'x' . $dtime[6] . $dtime[7]
                   Western union point .  'x' . $dtime[4] . $dtime[5]
                  . 'x' . $dtime[2] . $dtime[3]
                  . 'x' . $dtime[0] . $dtime[1];
        eval('$hexdtime = "' . $hexdtime . '";');
        $fr   = "x50x4bx03x04";
        $fr   .= "x14x00";            // ver needed to extract
        $fr   .= "x00x00";            // gen purpose bit flag
        $fr   .= "x08x00";            // 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 = "x50x4bx01x02";
        $cdrec .= "x00x00";                // version made by
        $cdrec .= "x14x00";                // version needed to extract
        $cdrec .= "x00x00";                // gen purpose bit flag
        $cdrec .= "x08x00";                // 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;
    }// end of the 'addFile()' method
 /**
     * Dumps out file
     *
     * @return  string  the zipped file
     *
     * @access public
*/
 function file()
 {
 $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
 "x00x00"; // . zip file comment length
 } // end of the 'file()' method
} // end of the 'PHPZip' class
?>

The PHP zip compression class implemented by foreigners, I personally feel that it is good. It contains a lot of application skills of PHP practical functions, especially the application of function pack, crc32, gzcompress and other functions, which are worth learning and reference.