PHP压缩函数使用

class PHPZip2
{
function Zip($dir, $zipfilename)
{
if (@function_exists(“gzcompress”))
{
$curdir = getcwd();
if (is_array($dir))
{
$filelist = $dir;
}
else
{
$filelist = $this -> GetFileList($dir);
}

if ((!empty($dir))&&(!is_array($dir))&&(file_exists($dir))) chdir($dir);
else chdir($curdir);

if (count($filelist)>0)
{
foreach($filelist as $filename)
{
if (is_file($filename))
{
$fd = fopen ($filename, “r”);
$content = fread ($fd, filesize ($filename));
fclose ($fd);

if (is_array($dir)) $filename = basename($filename);
$this -> addFile($content, $filename);
}
}
$out = $this -> file();

chdir($curdir);
$fp = fopen($zipfilename, “w”);
fwrite($fp, $out, strlen($out));
fclose($fp);
}
return 1;
}
else return 0;
}

function GetFileList($dir)
{
if (file_exists($dir))
{
$args = func_get_args();
$pref = $args[1];

$dh = opendir($dir);
while($files = readdir($dh))
{
if (($files!=”.”)&&($files!=”..”))
{
if (is_dir($dir.$files))
{
$curdir = getcwd();
chdir($dir.$files);
$file = array_merge($file, $this -> GetFileList(“”, “$pref$files/”));
chdir($curdir);
}
else $file[]=$pref.$files;
}
}
closedir($dh);
}
return $file;
}

var $datasec      = array();
var $ctrl_dir     = array();
var $eof_ctrl_dir = “\x50\x4b\x05\x06\x00\x00\x00\x00″;
var $old_offset   = 0;

/**
* Converts an Unix timestamp to a four byte DOS date and time format (date
* in high two bytes, time in low two bytes allowing magnitude comparison).
*
* @param integer the current Unix timestamp
*
* @return integer the current date in a four byte DOS format
*
* @access 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;
} // end if

return (($timearray["year"] – 1980) << 25) | ($timearray["mon"] << 21) | ($timearray["mday"] << 16) |
($timearray["hours"] << 11) | ($timearray["minutes"] << 5) | ($timearray["seconds"] >> 1);
} // end online casino of the “unix2DosTime()” method

/**
* Adds “file” to archive
*
* @param string   file contents
* @param string   name of the file in the archive (may contains the path)
* @param integer the current timestamp
*
* @access public
*/
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;
} // end of the “addFile()” method

/**
* Dumps out file
*
* @return string the zipped file
*
* @access public
*/
function file()
{
$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
} // end of the “file()” method

} // end of the “PHPZip” class
$zipfilename=date(“Y-m-d-H-i-s”).”.zip”;
$z = new PHPZip2();
$z -> Zip($arr_file, “./company/”.$company_id.”_”.date(“YmdHis”).”.zip”);

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