Detailed explanation of usage of PHPZip class

This article mainly introduces the usage of PHPZip class for php file compression, and analyzes the definition and related usage techniques of PHPZip class with examples. I hope to be helpful. This article describes the use of the PHPZip class for php file compression. Share it with everyone for your reference.

The details are as follows:

<?php
//
// PHPZip v1.2 by Sext (sext@neud.net) 
//
// Makes zip archive
//
// Based on "Zip file creation class", uses zLib
//
//
class PHPZip
{
function Zip($dir, $zipfilename)
{
    if (@function_exists(&#39;gzcompress&#39;))
    {
     $curdir = getcwd();
     if (is_array($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[&#39;year&#39;] < 1980) {
     $timearray[&#39;year&#39;] = 1980;
     $timearray[&#39;mon&#39;]   = 1;
     $timearray[&#39;mday&#39;] = 1;
     $timearray[&#39;hours&#39;] = 0;
     $timearray[&#39;minutes&#39;] = 0;
     $timearray[&#39;seconds&#39;] = 0;
    } // end if
    return (($timearray[&#39;year&#39;] - 1980) << 25) | ($timearray[&#39;mon&#39;] << 21) | ($timearray[&#39;mday&#39;] << 16) |
      ($timearray[&#39;hours&#39;] << 11) | ($timearray[&#39;minutes&#39;] << 5) | ($timearray[&#39;seconds&#39;] >> 1);
} // end of the &#39;unix2DosTime()&#39; method
/**
  * Adds "file" to archive
  *
  * @param  string file contents
  * @param  string name of the file in the archive (may contains the path)
  * @param  integer  the current timestamp
  *
  * @access public
  */
function addFile($data, $name, $time = 0)
{
    $name   = str_replace(&#39;&#39;, &#39;/&#39;, $name);
 
    $dtime = dechex($this->unix2DosTime($time));
    $hexdtime = &#39;x&#39; . $dtime[6] . $dtime[7]
        . &#39;x&#39; . $dtime[4] . $dtime[5]
        . &#39;x&#39; . $dtime[2] . $dtime[3]
        . &#39;x&#39; . $dtime[0] . $dtime[1];
    eval(&#39;$hexdtime = "&#39; . $hexdtime . &#39;";&#39;);
    $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(&#39;V&#39;, $crc);     // crc32
    $fr  .= pack(&#39;V&#39;, $c_len);      // compressed filesize
    $fr  .= pack(&#39;V&#39;, $unc_len);    // uncompressed filesize
    $fr  .= pack(&#39;v&#39;, strlen($name)); // length of filename
    $fr  .= pack(&#39;v&#39;, 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(&#39;V&#39;, $crc);         // crc32
    $fr .= pack(&#39;V&#39;, $c_len);       // compressed filesize
    $fr .= pack(&#39;V&#39;, $unc_len);     // uncompressed filesize
    // add this entry to array
    $this -> datasec[] = $fr;
    $new_offset    = strlen(implode(&#39;&#39;, $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(&#39;V&#39;, $crc);      // crc32
    $cdrec .= pack(&#39;V&#39;, $c_len);    // compressed filesize
    $cdrec .= pack(&#39;V&#39;, $unc_len);  // uncompressed filesize
    $cdrec .= pack(&#39;v&#39;, strlen($name) ); // length of filename
    $cdrec .= pack(&#39;v&#39;, 0 );     // extra field length
    $cdrec .= pack(&#39;v&#39;, 0 );     // file comment length
    $cdrec .= pack(&#39;v&#39;, 0 );     // disk number start
    $cdrec .= pack(&#39;v&#39;, 0 );     // internal file attributes
    $cdrec .= pack(&#39;V&#39;, 32 );     // external file attributes - &#39;archive&#39; bit set
    $cdrec .= pack(&#39;V&#39;, $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 &#39;addFile()&#39; method
/**
  * Dumps out file
  *
  * @return  string  the zipped file
  *
  * @access public
  */
function file()
{
    $data = implode(&#39;&#39;, $this -> datasec);
    $ctrldir = implode(&#39;&#39;, $this -> ctrl_dir);
 
    return
     $data .
     $ctrldir .
     $this -> eof_ctrl_dir .
     pack(&#39;v&#39;, sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
     pack(&#39;v&#39;, sizeof($this -> ctrl_dir)) .  // total # of entries overall
     pack(&#39;V&#39;, strlen($ctrldir)) .      // size of central dir
     pack(&#39;V&#39;, strlen($data)) .       // offset to start of central dir
     "x00x00";               // .zip file comment length
} // end of the &#39;file()&#39; method
} // end of the &#39;PHPZip&#39; class
?>

How to use:

<?php
$z = new PHPZip(); //新建立一个zip的类
//方法一：
$z -> Zip("", "out1.zip"); //添加当前目录和子目录下的所有档案
//方法二：
$files=array(&#39;1.txt&#39;,&#39;gb.txt&#39;);
$files[]=&#39;5.txt&#39;;
$z -> Zip($files, "out2.zip"); //添加文件列表
//方法三：
$z -> Zip("/usr/local/sext/", "out3.zip"); //添加指定目录
?>

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