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：
<?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($data)) . // offset to start of central dir "x00x00"; // .zip file comment length} // end of the "file()" method} // end of the "PHPZip" class?>使用方法：
<?php$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。
