(转载自：http://www.yii-china.com/post/detail/471.html)
前言：
前一段时间,有人有同一个文件复制几份不同名字批量下载需求--有点奇葩（也许是我理解错了,只是批量下载罢了）
参考来源：http://www.oschina.net/code/snippet_167936_6898 不过源码我做了部分修改。如果大家对这个类
有别的需求可以在下方留言，在我能力范围内，会尽量满足大家的需求。
实现思路：
方法一： 用php自带的zip扩展打包成 .zip文件下载，缺点要配置zip扩展，默认情况下php没有要去官网下载
方法二： 读取一个个文件内容利用gzcompress()字符串压缩和pack()打包成zip(原理高大上，其实我也不太懂！)
实现类如下：
使用说明：这个与框架无关放到相应的地方修改一下命名空间即可
<?php
namespace OrgUtil;
class PHPZip
{
private $ctrl_dir = array();
private $datasec = array();
/**********************************************************
* 压缩部分
**********************************************************/
// ------------------------------------------------------ //
// #遍历指定文件夹
//
// $archive = new PHPZip();
// $filelist = $archive->visitFile(文件夹路径);
// print "当前文件夹的文件:<p>
";
// foreach($filelist as $file)
// printf("%s<br>
", $file);
// ------------------------------------------------------ //
var $fileList = array();
public function visitFile($path)
{
global $fileList;
$path = str_replace("\", "/", $path);
$fdir = dir($path);
while (($file = $fdir->read()) !== false) {
if ($file == '.' || $file == '..') {
continue;
}
$pathSub = preg_replace("*/{2,}*", "/", $path . "/" . $file); // 替换多个反斜杠
$fileList[] = is_dir($pathSub) ? $pathSub . "/" : $pathSub;
if (is_dir($pathSub)) {
$this->visitFile($pathSub);
}
}
$fdir->close();
return $fileList;
}
private function unix2DosTime($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;
$timearray['seconds'] = 0;
}
return (($timearray['year'] - 1980) << 25)
| ($timearray['mon'] << 21)
| ($timearray['mday'] << 16)
| ($timearray['hours'] << 11)
| ($timearray['minutes'] << 5)
| ($timearray['seconds'] >> 1);
}
var $old_offset = 0;
private function addFile($data, $filename, $time = 0)
{
$filename = str_replace('\', '/', $filename);
$dtime = dechex($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";
$fr .= "x00x00";
$fr .= "x08x00";
$fr .= $hexdtime;
$unc_len = strlen($data);
$crc = crc32($data);
$zdata = gzcompress($data);
$c_len = strlen($zdata);
$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2);
$fr .= pack('V', $crc);
$fr .= pack('V', $c_len);
$fr .= pack('V', $unc_len);
$fr .= pack('v', strlen($filename));
$fr .= pack('v', 0);
$fr .= $filename;
$fr .= $zdata;
$fr .= pack('V', $crc);
$fr .= pack('V', $c_len);
$fr .= pack('V', $unc_len);
$this->datasec[] = $fr;
$new_offset = strlen(implode('', $this->datasec));
$cdrec = "x50x4bx01x02";
$cdrec .= "x00x00";
$cdrec .= "x14x00";
$cdrec .= "x00x00";
$cdrec .= "x08x00";
$cdrec .= $hexdtime;
$cdrec .= pack('V', $crc);
$cdrec .= pack('V', $c_len);
$cdrec .= pack('V', $unc_len);
$cdrec .= pack('v', strlen($filename));
$cdrec .= pack('v', 0);
$cdrec .= pack('v', 0);
$cdrec .= pack('v', 0);
$cdrec .= pack('v', 0);
$cdrec .= pack('V', 32);
$cdrec .= pack('V', $this->old_offset);
$this->old_offset = $new_offset;
$cdrec .= $filename;
$this->ctrl_dir[] = $cdrec;
}
var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
private function file()
{
$data = implode('', $this->datasec);
$ctrldir = implode('', $this->ctrl_dir);
return $data
. $ctrldir
. $this->eof_ctrl_dir
. pack('v', sizeof($this->ctrl_dir))
. pack('v', sizeof($this->ctrl_dir))
. pack('V', strlen($ctrldir))
. pack('V', strlen($data))
. "x00x00";
}
// ------------------------------------------------------ //
// #压缩到服务器
//
// $archive = new PHPZip();
// $archive->Zip("需压缩的文件所在目录", "ZIP压缩文件名");
// $archive->Zip("需压缩的文件路径列表", "ZIP压缩文件名");
// ------------------------------------------------------ //
public function Zip($dir, $saveName)
{
if (@!function_exists('gzcompress')) {
return;
}
ob_end_clean();
if(is_array($dir)){
$filelist = $dir;
}else{
$filelist = $this->visitFile($dir);
}
if (count($filelist) == 0) {
return;
}
foreach ($filelist as $file) {
if (!file_exists($file) || !is_file($file)) {
continue;
}
$fd = fopen($file, "rb");
$content = @fread($fd, filesize($file));
fclose($fd);
// 1.删除$dir的字符(./folder/file.txt删除./folder/)
// 2.如果存在/就删除(/file.txt删除/)
$file = substr($file, strlen($dir));
if (substr($file, 0, 1) == "\" || substr($file, 0, 1) == "/") {
$file = substr($file, 1);
}
$this->addFile($content, $file);
}
$out = $this->file();
$fp = fopen($saveName, "wb");
fwrite($fp, $out, strlen($out));
fclose($fp);
}
// ------------------------------------------------------ //
// #压缩并直接下载
//
// $archive = new PHPZip();
// $archive->ZipAndDownload("需压缩的文件所在目录",'保存文件名');没有后缀
// $archive->ZipAndDownload("需压缩的文件路径列表",'保存文件名');
// ------------------------------------------------------ //
public function ZipAndDownload($dir,$savename='')
{
if (@!function_exists('gzcompress')) {
return;
}
ob_end_clean();
if(is_array($dir)){
$filelist = $dir;
}else{
$filelist = $this->visitFile($dir);
}
if (count($filelist) == 0) {
return;
}
foreach ($filelist as $file) {
if (!file_exists($file) || !is_file($file)) {
continue;
}
$fd = fopen($file, "rb");
$content = @fread($fd, filesize($file));
fclose($fd);
// 1.删除$dir的字符(./folder/file.txt删除./folder/)
// 2.如果存在/就删除(/file.txt删除/)
$file = substr($file, strlen($dir));
if (substr($file, 0, 1) == "\" || substr($file, 0, 1) == "/") {
$file = substr($file, 1);
}
$this->addFile($content, $file);
}
$out = $this->file();
if($savename==''){
$savename = 'File'.date("YmdHis", time());
}
@header('Content-Encoding: none');
@header('Content-Type: application/zip');
@header('Content-Disposition: attachment ; filename=' . $savename . '.zip');
@header('Pragma: no-cache');
@header('Expires: 0');
print($out);
}
/**********************************************************
* 解压部分
**********************************************************/
// ------------------------------------------------------ //
// ReadCentralDir($zip, $zipfile)
// $zip是经过@fopen($zipfile, 'rb')打开的
// $zipfile是zip文件的路径
// ------------------------------------------------------ //
private function ReadCentralDir($zip, $zipfile)
{
$size = filesize($zipfile);
$max_size = ($size < 277) ? $size : 277;
@fseek($zip, $size - $max_size);
$pos = ftell($zip);
$bytes = 0x00000000;
while ($pos < $size) {
$byte = @fread($zip, 1);
$bytes = ($bytes << 8) | Ord($byte);
$pos++;
if ($bytes == 0x504b0506) {
break;
}
}
$data = unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size', fread($zip, 18));
$centd['comment'] = ($data['comment_size'] != 0) ? fread($zip, $data['comment_size']) : ''; // 注释
$centd['entries'] = $data['entries'];
$centd['disk_entries'] = $data['disk_entries'];
$centd['offset'] = $data['offset'];
$centd['disk_start'] = $data['disk_start'];
$centd['size'] = $data['size'];
$centd['disk'] = $data['disk'];
return $centd;
}
private function ReadCentralFileHeaders($zip)
{
$binary_data = fread($zip, 46);
$header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);
$header['filename'] = ($header['filename_len'] != 0) ? fread($zip, $header['filename_len']) : '';
$header['extra'] = ($header['extra_len'] != 0) ? fread($zip, $header['extra_len']) : '';
$header['comment'] = ($header['comment_len'] != 0) ? fread($zip, $header['comment_len']) : '';
if ($header['mdate'] && $header['mtime']) {
$hour = ($header['mtime'] & 0xF800) >> 11;
$minute = ($header['mtime'] & 0x07E0) >> 5;
$seconde = ($header['mtime'] & 0x001F) * 2;
$year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
$month = ($header['mdate'] & 0x01E0) >> 5;
$day = $header['mdate'] & 0x001F;
$header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
} else {
$header['mtime'] = time();
}
$header['stored_filename'] = $header['filename'];
$header['status'] = 'ok';
if (substr($header['filename'], -1) == '/') {
$header['external'] = 0x41FF0010;
} // 判断是否文件夹
return $header;
}
private function ReadFileHeader($zip)
{
$binary_data = fread($zip, 30);
$data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);
$header['filename'] = fread($zip, $data['filename_len']);
$header['extra'] = ($data['extra_len'] != 0) ? fread($zip, $data['extra_len']) : '';
$header['compression'] = $data['compression'];
$header['size'] = $data['size'];
$header['compressed_size'] = $data['compressed_size'];
$header['crc'] = $data['crc'];
$header['flag'] = $data['flag'];
$header['mdate'] = $data['mdate'];
$header['mtime'] = $data['mtime'];
if ($header['mdate'] && $header['mtime']) {
$hour = ($header['mtime'] & 0xF800) >> 11;
$minute = ($header['mtime'] & 0x07E0) >> 5;
$seconde = ($header['mtime'] & 0x001F) * 2;
$year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
$month = ($header['mdate'] & 0x01E0) >> 5;
$day = $header['mdate'] & 0x001F;
$header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
} else {
$header['mtime'] = time();
}
$header['stored_filename'] = $header['filename'];
$header['status'] = "ok";
return $header;
}
private function ExtractFile($header, $to, $zip)
{
$header = $this->readfileheader($zip);
if (substr($to, -1) != "/") {
$to .= "/";
}
if (!@is_dir($to)) {
@mkdir($to, 0777);
}
$pth = explode("/", dirname($header['filename']));
for ($i = 0; isset($pth[$i]); $i++) {
if (!$pth[$i]) {
continue;
}
$pthss .= $pth[$i] . "/";
if (!is_dir($to . $pthss)) {
@mkdir($to . $pthss, 0777);
}
}
if (!($header['external'] == 0x41FF0010) && !($header['external'] == 16)) {
if ($header['compression'] == 0) {
$fp = @fopen($to . $header['filename'], 'wb');
if (!$fp) {
return (-1);
}
$size = $header['compressed_size'];
while ($size != 0) {
$read_size = ($size < 2048 ? $size : 2048);
$buffer = fread($zip, $read_size);
$binary_data = pack('a' . $read_size, $buffer);
@fwrite($fp, $binary_data, $read_size);
$size -= $read_size;
}
fclose($fp);
touch($to . $header['filename'], $header['mtime']);
} else {
$fp = @fopen($to . $header['filename'] . '.gz', 'wb');
if (!$fp) {
return (-1);
}
$binary_data = pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']), Chr(0x00), time(), Chr(0x00), Chr(3));
fwrite($fp, $binary_data, 10);
$size = $header['compressed_size'];
while ($size != 0) {
$read_size = ($size < 1024 ? $size : 1024);
$buffer = fread($zip, $read_size);
$binary_data = pack('a' . $read_size, $buffer);
@fwrite($fp, $binary_data, $read_size);
$size -= $read_size;
}
$binary_data = pack('VV', $header['crc'], $header['size']);
fwrite($fp, $binary_data, 8);
fclose($fp);
$gzp = @gzopen($to . $header['filename'] . '.gz', 'rb') or die("Cette archive est compress!");
if (!$gzp) {
return (-2);
}
$fp = @fopen($to . $header['filename'], 'wb');
if (!$fp) {
return (-1);
}
$size = $header['size'];
while ($size != 0) {
$read_size = ($size < 2048 ? $size : 2048);
$buffer = gzread($gzp, $read_size);
$binary_data = pack('a' . $read_size, $buffer);
@fwrite($fp, $binary_data, $read_size);
$size -= $read_size;
}
fclose($fp);
gzclose($gzp);
touch($to . $header['filename'], $header['mtime']);
@unlink($to . $header['filename'] . '.gz');
}
}
return true;
}
// ------------------------------------------------------ //
// #解压文件
//
// $archive = new PHPZip();
// $zipfile = "ZIP压缩文件名";
// $savepath = "解压缩目录名";
// $zipfile = $unzipfile;
// $savepath = $unziptarget;
// $array = $archive->GetZipInnerFilesInfo($zipfile);
// $filecount = 0;
// $dircount = 0;
// $failfiles = array();
// set_time_limit(0); // 修改为不限制超时时间(默认为30秒)
//
// for($i=0; $i<count($array); $i++) {
// if($array[$i][folder] == 0){
// if($archive->unZip($zipfile, $savepath, $i) > 0){
// $filecount++;
// }else{
// $failfiles[] = $array[$i][filename];
// }
// }else{
// $dircount++;
// }
// }
// set_time_limit(30);
//printf("文件夹:%d 解压文件:%d 失败:%d<br>
", $dircount, $filecount, count($failfiles));
//if(count($failfiles) > 0){
// foreach($failfiles as $file){
// printf("·%s<br>
", $file);
// }
//}
// ------------------------------------------------------ //
public function unZip($zipfile, $to, $index = Array(-1))
{
$ok = 0;
$zip = @fopen($zipfile, 'rb');
if (!$zip) {
return (-1);
}
$cdir = $this->ReadCentralDir($zip, $zipfile);
$pos_entry = $cdir['offset'];
if (!is_array($index)) {
$index = array($index);
}
for ($i = 0; $index[$i]; $i++) {
if (intval($index[$i]) != $index[$i] || $index[$i] > $cdir['entries']) {
return (-1);
}
}
for ($i = 0; $i < $cdir['entries']; $i++) {
@fseek($zip, $pos_entry);
$header = $this->ReadCentralFileHeaders($zip);
$header['index'] = $i;
$pos_entry = ftell($zip);
@rewind($zip);
fseek($zip, $header['offset']);
if (in_array("-1", $index) || in_array($i, $index)) {
$stat[$header['filename']] = $this->ExtractFile($header, $to, $zip);
}
}
fclose($zip);
return $stat;
}
/**********************************************************
* 其它部分
**********************************************************/
// ------------------------------------------------------ //
// #获取被压缩文件的信息
//
// $archive = new PHPZip();
// $array = $archive->GetZipInnerFilesInfo(ZIP压缩文件名);
// for($i=0; $i<count($array); $i++) {
// printf("<b>·%s</b><br>
", $array[$i][filename]);
// foreach($array[$i] as $key => $value)
// printf("%s => %s<br>
", $key, $value);
// print "
<p>------------------------------------<p>
";
// }
// ------------------------------------------------------ //
public function GetZipInnerFilesInfo($zipfile)
{
$zip = @fopen($zipfile, 'rb');
if (!$zip) {
return (0);
}
$centd = $this->ReadCentralDir($zip, $zipfile);
@rewind($zip);
@fseek($zip, $centd['offset']);
$ret = array();
for ($i = 0; $i < $centd['entries']; $i++) {
$header = $this->ReadCentralFileHeaders($zip);
$header['index'] = $i;
$info = array(
'filename' => $header['filename'], // 文件名
'stored_filename' => $header['stored_filename'], // 压缩后文件名
'size' => $header['size'], // 大小
'compressed_size' => $header['compressed_size'], // 压缩后大小
'crc' => strtoupper(dechex($header['crc'])), // CRC32
'mtime' => date("Y-m-d H:i:s", $header['mtime']), // 文件修改时间
'comment' => $header['comment'], // 注释
'folder' => ($header['external'] == 0x41FF0010 || $header['external'] == 16) ? 1 : 0, // 是否为文件夹
'index' => $header['index'], // 文件索引
'status' => $header['status'] // 状态
);
$ret[] = $info;
unset($header);
}
fclose($zip);
return $ret;
}
// ------------------------------------------------------ //
// #获取压缩文件的注释
//
// $archive = new PHPZip();
// echo $archive->GetZipComment(ZIP压缩文件名);
// ------------------------------------------------------ //
public function GetZipComment($zipfile)
{
$zip = @fopen($zipfile, 'rb');
if (!$zip) {
return (0);
}
$centd = $this->ReadCentralDir($zip, $zipfile);
fclose($zip);
return $centd[comment];
}
}
?>
使用方法：更多用法看源码实现--代码通俗易懂^v^
$archive = new PHPZip(); $archive->Zip($zipdir, $savename);//文件夹压缩 $archive->Zip($filelist, $savename);//文件列表压缩 $archive->ZipAndDownload($zipdowndir);//压缩下载 $archive->ZipAndDownload($filelist);//文件列表压缩下载
另外付下载原理--构造如下http头部：
$expire =180; //下载内容浏览器缓存时间 $showname //下载显示的文件名 $length //文件长度 $type //文件后缀
header("Pragma: public");
header("Cache-control: max-age=".$expire);
//header('Cache-Control: no-store, no-cache, must-revalidate');
header("Expires: " . gmdate("D, d M Y H:i:s",time()+$expire) . "GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s",time()) . "GMT");
header("Content-Disposition: attachment; filename=".$showname);
header("Content-Length: ".$length);
header("Content-type: ".$type);
header('Content-Encoding: none');
header("Content-Transfer-Encoding: binary" );
readfile($filename);