php压缩文件帮助类

<?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 = "/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

}

}

?> 

还有另外一个比较简单的

<?php  

class createzip

{

/*  @creates a compressed zip file  将多个文件压缩成一个zip文件的函数

*   @$files 数组类型  实例array("1.jpg","2.jpg");

*   @destination  目标文件的路径  如"c:/androidyue.zip"

*   @$overwrite 是否为覆盖与目标文件相同的文件

*   @Recorded By Androidyue

*   @Blog:http://thinkblog.sinaapp.com

 */

function create_zip($files = array(),$destination = '',$overwrite = false)

{

    //如果zip文件已经存在并且设置为不重写返回false

    if(file_exists($destination) && !$overwrite) { return false; }

    $valid_files = array();

    //if files were passed in...

    //获取到真实有效的文件名

    if(is_array($files)) {

        //cycle through each file

        foreach($files as $file) {

        //make sure the file exists

            if(file_exists($file)) {

            $valid_files[] = $file;

            }

        }

    }

    //如果存在真实有效的文件

    if(count($valid_files))

    {

        //create the archive

        $zip = new ZipArchive();

        //打开文件       如果文件已经存在则覆盖，如果没有则创建

        if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {

            return false;

        }

        //向压缩文件中添加文件

        foreach($valid_files as $file) {

            $zip->addFile($file,$file);

        }

        //关闭文件

        $zip->close();

        //检测文件是否存在

        return file_exists($destination);

    }

    else{

        //如果没有真实有效的文件返回false

        return false;

    }

}  

}

/****

//测试函数

$files=array('temp.php','test.php');

create_zip($files, 'myzipfile.zip', true);

****/

?>