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　　PHP压缩类：用于在线压缩文件、文档、目录等，附有使用方法，不想了解类原理的可直接按使用方法调用该类：

<?php
//PHP压缩类代码开始
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 $old_offset = 0;
function unix2DosTime($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 ifreturn (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
}
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"; $fr .= "x00x00"; $fr .= "x08x00";$fr .= $hexdtime; $unc_len = strlen($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', $crc);$fr    .= pack('V', $c_len);$fr    .= pack('V', $unc_len);$fr    .= pack('v', strlen($name));$fr    .= pack('v', 0);$fr    .= $name;$fr .= $zdata;$fr .= pack('V', $crc); $fr .= pack('V', $c_len);$fr .= pack('V', $unc_len);$this -> datasec[] = $fr;$new_offset        = strlen(implode('', $this->datasec));$cdrec = "x50x4bx01x02";$cdrec .= "x00x00";$cdrec .= "x14x00";$cdrec .= "x00x00";$cdrec .= "x08x00";$cdrec .= $hexdtime;$cdrec .= pack('V', $crc);$cdrec .= pack('V', $c_len);$cdrec .= pack('V', $unc_len);$cdrec .= pack('v', strlen($name) );$cdrec .= pack('v', 0 );$cdrec .= pack('v', 0 );$cdrec .= pack('v', 0 );$cdrec .= pack('v', 0 );$cdrec .= pack('V', 32 );$cdrec .= pack('V', $this -> old_offset );$this -> old_offset = $new_offset;$cdrec .= $name;$this -> ctrl_dir[] = $cdrec;
}
function file()
{$data = implode('', $this -> datasec);$ctrldir = implode('', $this -> ctrl_dir);return$data .$ctrldir .$this -> eof_ctrl_dir .pack('v', sizeof($this -> ctrl_dir)) .pack('v', sizeof($this -> ctrl_dir)) .pack('V', strlen($ctrldir)) . pack('V', strlen($data)) ."x00x00";
}
} //PHP压缩类结束
?>

　　代码帖完了，那么使用这个压缩类呢?下面告诉你三种调用方法：

<?php
//不管哪种方法，都需要先新建zip类
$z = new PHPZip();//方法一：
$z -> Zip("", "out1.zip"); //添加当前目录和子目录下的所有文件//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
?>

　　到此PHP压缩类和调用方法都告诉你了，快动手测试一下吧，希望你会得到惊喜。

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