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：

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

<?php

//

// 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

?>

使用方法：

php文件压缩之PHPZip类用法实例

相关文章

快网idc优惠网

相关文章

微信

快网idc优惠网

QQ交流群