php上传zip文件在线解压文件在指定目录下，CI框架版本

我从网上找的文件php在线解压zip压缩文件

<?php
class m_zip extends CI_Model {
var $total_files = 0;
var $total_folders = 0;

function Extract($zn, $to, $index = Array (
-1
)) {
$ok = 0;
$zip = @ fopen($zn, 'rb');
if (!$zip)
return (-1);
$cdir = $this->ReadCentralDir($zip, $zn);
$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;
}

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, $data['filename_len']);
if ($data['extra_len'] != 0) {
$header['extra'] = fread($zip, $data['extra_len']);
} else {
$header['extra'] = '';
}

$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;
}

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);

if ($header['filename_len'] != 0)
$header['filename'] = fread($zip, $header['filename_len']);
else
$header['filename'] = '';

if ($header['extra_len'] != 0)
$header['extra'] = fread($zip, $header['extra_len']);
else
$header['extra'] = '';

if ($header['comment_len'] != 0)
$header['comment'] = fread($zip, $header['comment_len']);
else
$header['comment'] = '';

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;
return $header;
}

function ReadCentralDir($zip, $zip_name) {
$size = filesize($zip_name);

if ($size < 277)
$maximum_size = $size;
else
$maximum_size = 277;

@ fseek($zip, $size - $maximum_size);
$pos = ftell($zip);
$bytes = 0x00000000;

while ($pos < $size) {
$byte = @ fread($zip, 1);
$bytes = ($bytes << 8) | ord($byte);
if ($bytes == 0x504b0506 or $bytes == 0x2e706870504b0506) {
$pos++;
break;
}
$pos++;
}

$fdata = fread($zip, 18);

$data = @ unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size', $fdata);

if ($data['comment_size'] != 0)
$centd['comment'] = fread($zip, $data['comment_size']);
else
$centd['comment'] = '';
$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;
}

function ExtractFile($header, $to, $zip) {
$header = $this->readfileheader($zip);

if (substr($to, -1) != "/")
$to .= "/";
if ($to == './')
$to = '';
$pth = explode("/", $to . $header['filename']);
$mydir = '';
for ($i = 0; $i < count($pth) - 1; $i++) {
if (!$pth[$i])
continue;
$mydir .= $pth[$i] . "/";
if ((!is_dir($mydir) && @ mkdir($mydir, 0777)) || (($mydir == $to . $header['filename'] || ($mydir == $to && $this->total_folders == 0)) && is_dir($mydir))) {
@ chmod($mydir, 0777);
$this->total_folders++;
echo "<input name='dfile[]' type='checkbox' value='$mydir' checked> <a href='$mydir' target='_blank'>目录: $mydir</a><br>";
}
}

if (strrchr($header['filename'], '/') == '/')
return;

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 . $header['filename'] . '.gz', 'rb') or die("Cette archive est compress閑");
if (!$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');

}
}

$this->total_files++;
echo "<input name='dfile[]' type='checkbox' value='$to$header[filename]' checked> <a href='$to$header[filename]' target='_blank'>文件: $to$header[filename]</a><br>";

return true;
}

// end class
}
?>