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Usage examples of PHPZip class for php file compression_PHP tutorial

WBOYOriginal: 2016-07-13 09:50:13805browse

Usage examples of PHPZip class for php file compression

This article describes the usage of PHPZip class for php file compression. Share it with everyone for your reference. The details are as follows:

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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'] < 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 = "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

How to use:

$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

2 3

<🎜>$z = new PHPZip(); //Create a new zip class<🎜> <🎜>//Method 1: <🎜> <🎜>$z -> Zip("", "out1.zip"); //Add all files in the current directory and subdirectories //Method 2: $files=array('1.txt','gb.txt'); $files[]='5.txt'; $z -> Zip($files, "out2.zip"); //Add file list //Method 3: $z -> Zip("/usr/local/sext/", "out3.zip"); //Add the specified directory ?>

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Usage examples of PHPZip class for php file compression_PHP tutorial

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