php文件压缩之PHPZip类用法实例

本文实例讲述了php文件压缩之PHPZip类用法。分享给大家供大家参考。具体如下：

<?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('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]        . '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?>