php生成zip压缩文件实例代码讲解

   

php压缩文件zip的例子
1.请先 下载我准备好的zip.php工具类，下载后解压，将里面的文件放入对应的目录中，我是放在虚拟目录下的include文件夹中。
2.在你的php文件中加入下面代码即可
用法：
require_once "./include/zip.php";
$zip = new PHPZip();
//$zip -> createZip("要压缩的文件夹目录地址", "压缩后的文件名.zip");　　 //只生成不自动下载
$zip -> downloadZip("要压缩的文件夹目录地址", "压缩后的文件名.zip");　//自动下载

实例：可以参考下面的伪代码来看一个具体的使用场景： 代码
require_once "./include/zip.php";
if (!$download) {
exit();
}
set_time_limit(60);
$tmpManager = new TmpManager(); //假设我们有一个类来完成后面的操作
$tempfolder = array();
$tempfile = array(); //假设我们是通过在页面上选择checkbox来下载已选的文件夹或文件，并一同打包
for($i = 0;$i < $checkboxnum;$i ) {
$value = ${"select".$i};
if ($value != ) {
$this_type = substr($value, 0, 1);
$this_id = substr($value, 1);
//将文件夹和文件的情况分开处理
if ($this_type == d) {
$tempfolder[] = $this_id;
}
elseif ($this_type == f) {

$tempfile[] = $this_id;
}
}
}
@mkdir($tempdir);
$curtempdir = "$tempdir/".$userid; //不同用户在不同的临时文件夹下操作
if (file_exists($curtempdir)) {
$tmpManager->DeleteDir($curtempdir); //删除旧的文件夹
}
if (sizeof($tempfolder) > 0 || sizeof($tempfile) > 0) {
mkdir($curtempdir, 0777); //如果有要打包的文件货文件夹，重新创建文件夹
}
if (sizeof($tempfile) > 0) {
$tmpManager->CopyFile($tempfile,$curtempdir); //将要下载的文件copy到创建的文件夹
}
if (sizeof($tempfolder) > 0) {
$tmpManager->CopyFolder($tempfolder,$curtempdir); //将要下载的文件夹copy到创建的文件夹
}
$zip = new PHPZip();
$zip -> downloadZip($curtempdir, "file_".date(Ymd).".zip");//打包并下载

压缩类:

1. <?php
2. /*
3. File name: /include/zip.php
4. Author: Horace 2009/04/15
5. */
6. class PHPZip{
7. var $dirInfo = array("0","0");
8. var $rootDir = ;
9. var $datasec = array();
10. var $ctrl_dir = array();
11. var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
12. var $old_offset = 0;
13. function downloadZip(){
14.         createZip($dir, $zipfilename, true);
15. }
16. function createZip($dir, $zipfilename, $autoDownload = false){
17. if (@function_exists(gzcompress)){
18. @set_time_limit("0");
19. if (is_array($dir)){
20. $fd = fopen ($dir, "r");
21. 
    
22. $fileValue = fread ($fd, filesize ($filename));
23. fclose ($fd);
24. if (is_array($dir)) $filename = basename($dir);
25. $this -> addFile($fileValue, "$filename");
26. }else{
27. $this->dirTree($dir,$dir);
28. }
29. $zipfilenametemp = time().$zipfilename;
30. $out = $this -> filezip();
31. $fp = fopen($zipfilenametemp, "w");
32. fwrite($fp, $out, strlen($out));
33. fclose($fp);
34. $filesize = filesize($zipfilenametemp);
35. if ($filesize < 104857600) {
36. if($autoDownload){
37. header("Content-type: application/octet-stream");
38. header("Content-disposition: attachment; filename=".$zipfilename);
39. }
40. echo $this -> filezip();
41. }else{
42. echo "create zip error!";
43. }
44. unlink($zipfilenametemp);
45. }
46. }
47. //get dir tree..
48. 
    
49. function dirTree($directory,$rootDir){
50. global $_SERVER,$dirInfo,$rootDir;
51. $fileDir=$rootDir;
52. $myDir=dir($directory);
53. while($file=$myDir->read()){
54. 
    
55. 
    
56. if(is_dir("$directory/$file") and $file!="." and $file!=".."){
57. $dirInfo[0] ;
58. $rootDir ="$fileDir$file/";
59. $this -> addFile(, "$rootDir");
60. //go on ns folders
61. 
    
62. $this->dirTree("$directory/$file",$rootDir);
63. }else{
64. if($file!="." and $file!=".."){
65. $dirInfo[1] ;
66. //$fd = fopen ("$directory/$file", "r");
67. 
    
68. $fileValue = file_get_contents("$directory/$file");
69. //fclose ($fd);
70. 
    
71. $this -> addFile($fileValue, "$fileDir$file");
72. }
73. }
74. }
75. $myDir->close();
76. }
77. function unix2DosTime($unixtime = 0) {
78.         $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
79.         if ($timearray[year] < 1980) {
80.         $timearray[year] = 1980;
81.         $timearray[mon] = 1;
82.         $timearray[mday] = 1;
83.         $timearray[hours] = 0;
84.         $timearray[minutes] = 0;
85.         $timearray[seconds] = 0;
86. } // end if
87. 
    
88. return (($timearray[year] - 1980) << 25) | ($timearray[mon] << 21) | ($timearray[mday] << 16) |
89. ($timearray[hours] << 11) | ($timearray[minutes] << 5) | ($timearray[seconds] >> 1);
90. }
91. function addFile($data, $name, $time = 0){
92. $name = str_replace(, /, $name);
93. $dtime = dechex($this->unix2DosTime($time));
94. $hexdtime = x . $dtime[6] . $dtime[7]
95. . x . $dtime[4] . $dtime[5]
96. . x . $dtime[2] . $dtime[3]
97. . x . $dtime[0] . $dtime[1];
98. eval($hexdtime = " . $hexdtime . ";);
99. $fr = "x50x4bx03x04";
100. $fr .= "x14x00"; // ver needed to extract
101. $fr .= "x00x00"; // gen purpose bit flag
102. $fr .= "x08x00"; // compression method
103. $fr .= $hexdtime; // last mod time and date
104. // "local file header" segment
105. $unc_len = strlen($data);
106. $crc = crc32($data);
107. $zdata = gzcompress($data);
108. $c_len = strlen($zdata);
109. $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
110. $fr .= pack(V, $crc); // crc32
111. $fr .= pack(V, $c_len); // compressed filesize
112. $fr .= pack(V, $unc_len); // uncompressed filesize
113. $fr .= pack(v, strlen($name)); // length of filename
114. $fr .= pack(v, 0); // extra field length
115. $fr .= $name;
116. // "file data" segment
117. $fr .= $zdata;
118. // "data descriptor" segment (optional but necessary if archive is not
119. // served as file)
120. $fr .= pack(V, $crc); // crc32
121. $fr .= pack(V, $c_len); // compressed filesize
122. $fr .= pack(V, $unc_len); // uncompressed filesize
123. // add this entry to array
124. $this -> datasec[] = $fr;
125. $new_offset = strlen(implode(, $this->datasec));
126. // now add to central directory record
127. $cdrec = "x50x4bx01x02";
128. $cdrec .= "x00x00"; // version made by
129. $cdrec .= "x14x00"; // version needed to extract
130. $cdrec .= "x00x00"; // gen purpose bit flag
131. $cdrec .= "x08x00"; // compression method
132. $cdrec .= $hexdtime; // last mod time & date
133. $cdrec .= pack(V, $crc); // crc32
134. $cdrec .= pack(V, $c_len); // compressed filesize
135. $cdrec .= pack(V, $unc_len); // uncompressed filesize
136. $cdrec .= pack(v, strlen($name) ); // length of filename
137. $cdrec .= pack(v, 0 ); // extra field length
138. $cdrec .= pack(v, 0 ); // file comment length
139. $cdrec .= pack(v, 0 ); // disk number start
140. $cdrec .= pack(v, 0 ); // internal file attributes
141. $cdrec .= pack(V, 32 ); // external file attributes - archive bit set
142. $cdrec .= pack(V, $this -> old_offset ); // relative offset of local header
143. $this -> old_offset = $new_offset;
144. $cdrec .= $name;
145. // optional extra field, file comment