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php文件压缩之PHPZip类用法实例

　　本文实例讲述了php文件压缩之PHPZip类用法。分享给大家供大家参考。具体如下：

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// PHPZip v1.2 by Sext (sext@neud.net)

// Makes zip archive

// Based on "Zip file creation class", uses zLib

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 = "x50x4bx05x06x00x00x00x00";

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']

$timearray['year'] = 1980;

$timearray['mon'] = 1;

$timearray['mday'] = 1;

$timearray['hours'] = 0;

$timearray['minutes'] = 0;

$timearray['seconds'] = 0;

} // end if

return (($timearray['year'] - 1980)

($timearray['hours'] > 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 = "x50x4bx03x04";

$fr .= "x14x00"; // ver needed to extract

$fr .= "x00x00"; // gen purpose bit flag

$fr .= "x08x00"; // 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 = "x50x4bx01x02";

$cdrec .= "x00x00"; // version made by

$cdrec .= "x14x00"; // version needed to extract

$cdrec .= "x00x00"; // gen purpose bit flag

$cdrec .= "x08x00"; // 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

"x00x00"; // .zip file comment length

} // end of the 'file()' method

} // end of the 'PHPZip' class

　　使用方法：

$z = new PHPZip(); //新建立一个zip的类

//方法一：

$z -> Zip("", "out1.zip"); //添加当前目录和子目录下的所有档案

//方法二：

$files=array('1.txt','gb.txt');

$files[]='5.txt';

$z -> Zip($files, "out2.zip"); //添加文件列表

//方法三：

$z -> Zip("/usr/local/sext/", "out3.zip"); //添加指定目录

　　希望本文所述对大家的php程序设计有所帮助。