php生成zip壓縮文件的方法詳解

2020-03-22 19:41:27

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復制代碼代碼如下:
require_once "./include/zip.php";
$zip = new PHPZip();
//$zip - createZip("要壓縮的文件夾目錄地址", "壓縮后的文件名.zip"); //只生成不自動下載
$zip - downloadZip("要壓縮的文件夾目錄地址", "壓縮后的文件名.zip"); //自動下載

實例：可以參考下面的偽代碼來看一個具體的使用場景：
代碼
復制代碼代碼如下:
require_once "./include/zip.php";
if (!$download) {
exit();
}
set_time_limit(60);
$tmpManager = new TmpManager(); //假設我們有一個類來完成后面的操作
$tempfolder = array();
$tempfile = array();
//假設我們是通過在頁面上選擇checkbox來下載已選的文件夾或文件，并一同打包
for($i = 0;$i $checkboxnum;$i++) {
$html' target='_blank'>value = ${"select".$i};
if ($value != '') {
$this_type = substr($value, 0, 1);
$this_id = substr($value, 1);
//將文件夾和文件的情況分開處理
if ($this_type == 'd') {
$tempfolder[] = $this_id;
}
elseif ($this_type == 'f') {
$tempfile[] = $this_id;
}
}
}
@mkdir($tempdir);
$curtempdir = "$tempdir/".$userid; //不同用戶在不同的臨時文件夾下操作
if (file_exists($curtempdir)) {
$tmpManager- DeleteDir($curtempdir); //刪除舊的文件夾
}
if (sizeof($tempfolder) 0 || sizeof($tempfile) 0) {
mkdir($curtempdir, 0777); //如果有要打包的文件貨文件夾，重新創建文件夾
}
if (sizeof($tempfile) 0) {
$tmpManager- CopyFile($tempfile,$curtempdir); //將要下載的文件copy到創建的文件夾
}
if (sizeof($tempfolder) 0) {
$tmpManager- CopyFolder($tempfolder,$curtempdir); //將要下載的文件夾copy到創建的文件夾
}
$zip = new PHPZip();
$zip - downloadZip($curtempdir, "file_".date('Ymd').".zip"); //打包并下載

zip.php
復制代碼代碼如下:
?php
/*
File name: /include/zip.php
Author: Horace 2009/04/15
*/
class PHPZip{
var $dirInfo = array("0","0");
var $rootDir = '';
var $datasec = array();
var $ctrl_dir = array();
var $eof_ctrl_dir = "/x50/x4b/x05/x06/x00/x00/x00/x00";
var $old_offset = 0;
function downloadZip(){
createZip($dir, $zipfilename, true);
}
function createZip($dir, $zipfilename, $autoDownload = false){
if (@function_exists('gzcompress')){
@set_time_limit("0");
if (is_array($dir)){
$fd = fopen ($dir, "r");
$fileValue = fread ($fd, filesize ($filename));
fclose ($fd);
if (is_array($dir)) $filename = basename($dir);
$this - addFile($fileValue, "$filename");
}else{
$this- dirTree($dir,$dir);
}
$zipfilenametemp = time().$zipfilename;
$out = $this - filezip();
$fp = fopen($zipfilenametemp, "w");
fwrite($fp, $out, strlen($out));
fclose($fp);
$filesize = filesize($zipfilenametemp);
if ($filesize 104857600) {
if($autoDownload){
header("Content-type: application/octet-stream");
header("Content-disposition: attachment; filename=".$zipfilename);
}
echo $this - filezip();
}else{
echo "create zip error!";
}
unlink($zipfilenametemp);
}
}
//get dir tree..
function dirTree($directory,$rootDir){
global $_SERVER,$dirInfo,$rootDir;
$fileDir=$rootDir;
$myDir=dir($directory);
while($file=$myDir- read()){
if(is_dir("$directory/$file") and $file!="." and $file!=".."){
$dirInfo[0]++;
$rootDir ="$fileDir$file/";
$this - addFile('', "$rootDir");
//go on n's folders
$this- dirTree("$directory/$file",$rootDir);
}else{
if($file!="." and $file!=".."){
$dirInfo[1]++;
//$fd = fopen ("$directory/$file", "r");
$fileValue = file_get_contents("$directory/$file");
//fclose ($fd);
$this - addFile($fileValue, "$fileDir$file");
}
}
}
$myDir- close();
}
function unix2DosTime($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) | ($timearray['seconds'] 1);
}
function addFile($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 = "/x50/x4b/x03/x04";
$fr .= "/x14/x00"; // ver needed to extract
$fr .= "/x00/x00"; // gen purpose bit flag
$fr .= "/x08/x00"; // 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 = "/x50/x4b/x01/x02";
$cdrec .= "/x00/x00"; // version made by
$cdrec .= "/x14/x00"; // version needed to extract
$cdrec .= "/x00/x00"; // gen purpose bit flag
$cdrec .= "/x08/x00"; // 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;
}
function filezip(){
$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
"/x00/x00"; // .zip file comment length
}
}
?

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