PHP realizes the method of compressing multiple files into zip format and downloading them locally

This article mainly introduces the method of PHP to compress multiple files into zip format and download them locally. It involves PHP's reading and writing, judgment and zip compression related operation skills for files and directories. Friends in need can refer to the following

The example in this article describes how PHP implements compressing multiple files into zip format and downloading them locally. Share it with everyone for your reference, the details are as follows:

Without further ado, let’s go directly to the code

//这里需要注意该目录是否存在，并且有创建的权限
$zipname = 'path/test.zip'
//这是要打包的文件地址数组
$files = array("mypath/test1.txt","mypath/test2.pdf");
$zip = new ZipArchive();
$res = $zip->open($zipname, ZipArchive::CREATE);
if ($res === TRUE) {
 foreach ($files as $file) {
 //这里直接用原文件的名字进行打包，也可以直接命名，需要注意如果文件名字一样会导致后面文件覆盖前面的文件，所以建议重新命名
  $new_filename = substr($file, strrpos($file, '/') + 1);
  $zip->addFile($file, $new_filename);
 }
}
//关闭文件
$zip->close();

//这里是下载zip文件
header("Content-Type: application/zip");
header("Content-Transfer-Encoding: Binary");
header("Content-Length: " . filesize($zipname));
header("Content-Disposition: attachment; filename=\"" . basename($zipname) . "\"");
readfile($zipname);
exit;

Attachment: Here is another zip compression class for everyone:

<?php
# 
# 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(&#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
?>

Usage:

$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);

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