1.请先下载我准备好的zip.php工具类，下载后解压，将里面的文件放入对应的目录中，我是放在虚拟目录下的include文件夹中。
2.在你的php文件中加入下面代码即可

 
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 

实例：可以参考下面的伪代码来看一个具体的使用场景：
代码

 
require_once "./include/zip.php"; 
if (!$download) { 
exit(); 
} 
set_time_limit(60); 
$tmpManager = new TmpManager(); //假设我们有一个类来完成后面的操作 
$tempfolder = array(); 
$tempfile = array(); 
//假设我们是通过在页面上选择checkbox来下载已选的文件夹或文件，并一同打包 
for($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 
} 
$zip = new PHPZip(); 
$zip -> downloadZip($curtempdir, "file_".date('Ymd').".zip"); //打包并下载 

zip.php

<?php 
/* 
    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 = "\x50\x4b\x05\x06\x00\x00\x00\x00"; 
    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 n's 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 = "\x50\x4b\x03\x04"; 
$fr .= "\x14\x00"; // ver needed to extract 
$fr .= "\x00\x00"; // gen purpose bit flag 
$fr .= "\x08\x00"; // 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 = "\x50\x4b\x01\x02"; 
$cdrec .= "\x00\x00"; // version made by 
$cdrec .= "\x14\x00"; // version needed to extract 
$cdrec .= "\x00\x00"; // gen purpose bit flag 
$cdrec .= "\x08\x00"; // 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; 
} 
function filezip(){ 
$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 
"\x00\x00"; // .zip file comment length 
} 
} 
?> 

zip.php文件打包