操作步骤：

1，下载zip.php工具类，解压，将文件放到相关目录，比如这里放加include目录中。

2，在php程序中，引入代码：

require_once "./include/zip.php";

$zip = new PHPZip();

//$zip -> createZip("要压缩的文件夹目录地址", "压缩后的文件名.zip");　　 //只生成不自动下载

$zip -> downloadZip("要压缩的文件夹目录地址", "压缩后的文件名.zip");　//自动下载

?>

完整例子：

require_once "./include/zip.php";

if (!$download) {

exit();

}

set_time_limit(60);

$tmpManager = new TmpManager(); //假设有一个类来完成后面的操作

$tempfolder = array();

$tempfile = array(); //假设通过在页面上选择checkbox来下载已选的文件夹或文件，并一同打包

for($i = 0;$i < $checkboxnum;$i ) {

$value = ${"select".$i};

if ($value != ) {

$this_type = substr($value, 0, 1);

$this_id = substr($value, 1);

//将文件夹和文件的情况分开处理

if ($this_type == d) {

$tempfolder[] = $this_id;

}

elseif ($this_type == f) {

$tempfile[] = $this_id;

}

}

}

@mkdir($tempdir);

$curtempdir = "$tempdir/".$userid; //不同用户在不同的临时文件夹下操作

if (file_exists($curtempdir)) {

$tmpManager->DeleteDir($curtempdir); //删除旧的文件夹

}

if (sizeof($tempfolder) > 0 || sizeof($tempfile) > 0) {

mkdir($curtempdir, 0777); //如果有要打包的文件货文件夹，重新创建文件夹

}

if (sizeof($tempfile) > 0) {

$tmpManager->CopyFile($tempfile,$curtempdir); //将要下载的文件copy到创建的文件夹

}

if (sizeof($tempfolder) > 0) {

$tmpManager->CopyFolder($tempfolder,$curtempdir); //将要下载的文件夹copy到创建的文件夹

} //by www.jbxue.com

$zip = new PHPZip();

$zip -> downloadZip($curtempdir, "file_".date(Ymd).".zip");//打包并下载

?>

压缩类:

/*

File name: /include/zip.php

Author: Horace 2009/04/15

*/

class PHPZip{

var $dirInfo = array("0","0");

var $rootDir = ;

var $datasec = array();

var $ctrl_dir = array();

var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";

var $old_offset = 0;

function downloadZip(){

createZip($dir, $zipfilename, true);

}

function createZip($dir, $zipfilename, $autoDownload = false){

if (@function_exists(gzcompress)){

@set_time_limit("0");

if (is_array($dir)){

$fd = fopen ($dir, "r");

$fileValue = fread ($fd, filesize ($filename));

fclose ($fd);

if (is_array($dir)) $filename = basename($dir);

$this -> addFile($fileValue, "$filename");

}else{

$this->dirTree($dir,$dir);

}

$zipfilenametemp = time().$zipfilename;

$out = $this -> filezip();

$fp = fopen($zipfilenametemp, "w");

fwrite($fp, $out, strlen($out));

fclose($fp);

$filesize = filesize($zipfilenametemp);

if ($filesize < 104857600) {

if($autoDownload){

header("Content-type: application/octet-stream");

header("Content-disposition: attachment; filename=".$zipfilename);

}

echo $this -> filezip();

}else{

echo "create zip error!";

}

unlink($zipfilenametemp);

}

}

//get dir tree..

function dirTree($directory,$rootDir){

global $_SERVER,$dirInfo,$rootDir;

$fileDir=$rootDir;

$myDir=dir($directory);

while($file=$myDir->read()){

if(is_dir("$directory/$file") and $file!="." and $file!=".."){

$dirInfo[0] ;

$rootDir ="$fileDir$file/";

$this -> addFile(, "$rootDir");

//go on ns folders

$this->dirTree("$directory/$file",$rootDir);

}else{

if($file!="." and $file!=".."){

$dirInfo[1] ;

//$fd = fopen ("$directory/$file", "r");

$fileValue = file_get_contents("$directory/$file");

//fclose ($fd);

$this -> addFile($fileValue, "$fileDir$file");

}

}

}

$myDir->close();

}

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);

}

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

?>