欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

php文件压缩之PHPZip类用法实例

程序员文章站 2022-06-26 11:50:27
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:

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
?>

使用方法:

<?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('1.txt','gb.txt');
$files[]='5.txt';
$z -> zip($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
?>

希望本文所述对大家的php程序设计有所帮助。