将文件夹压缩成zip文件的php代码

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
}
}
?>