php生成zip压缩文件的实例详解

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：

<?php
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：

<?php
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.jb200.com
$zip = new PHPZip();
$zip -> downloadZip($curtempdir, "file_".date(Ymd).".zip");//打包并下载
?>

压缩类:

<?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 = "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
?>