php生成zip压缩文件

jy166102

<?php
class PHPZip {
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 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
?>


<?php
require'PHPZip.php';
$z = new PHPZip(); //新建立一个zip的类
//$z->Zip("","z.zip");当前文件夹压缩
$z->Zip(array("PHPZip.php"),"phpx.zip")
?>