php壓縮文件幫助類

    <?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   
}   
}   
?>   




還有另外一個比較簡單的
[php] view plaincopy

<?php    

class createzip  
{  
/*  @creates a compressed zip file  將多個文件壓縮成一個zip文件的函數  
*   @$files 數組類型  實例array("1.jpg","2.jpg");    
*   @destination  目標文件的路徑  如"c:/androidyue.zip"  
*   @$overwrite 是否為覆蓋與目標文件相同的文件  
*   @Recorded By Androidyue  
*   @Blog:http://thinkblog.sinaapp.com  
 */    
function create_zip($files = array(),$destination = '',$overwrite = false)   
{    
    //如果zip文件已經存在并且設置為不重寫返回false    
    if(file_exists($destination) && !$overwrite) { return false; }    
    $valid_files = array();    
    //if files were passed in...    
    //獲取到真實有效的文件名    
    if(is_array($files)) {    
        //cycle through each file    
        foreach($files as $file) {    
        //make sure the file exists    
            if(file_exists($file)) {    
            $valid_files[] = $file;    
            }    
        }    
    }    
    //如果存在真實有效的文件    
    if(count($valid_files))   
    {    
        //create the archive    
        $zip = new ZipArchive();    
        //打開文件       如果文件已經存在則覆蓋，如果沒有則創建    
        if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {    
            return false;    
        }    
        //向壓縮文件中添加文件    
        foreach($valid_files as $file) {    
            $zip->addFile($file,$file);    
        }    
        //關閉文件    
        $zip->close();    
        //檢測文件是否存在    
        return file_exists($destination);    
    }  
    else{    
        //如果沒有真實有效的文件返回false    
        return false;    
    }    
}    

}  
/****   
//測試函數  
$files=array('temp.php','test.php');  
create_zip($files, 'myzipfile.zip', true);  
****/    
?>    </pre>