提供一款超完美的php文件在线压缩程序,原理很简单就是把文件以二进制形式保存了,以前用过利用rar的内核程序,这是php自带的压缩功能,实例代码如下:

1. set_time_limit(0);
2. class phpzip{
3. var $file_count = 0 ;
4. var $datastr_len = 0;
5. var $dirstr_len = 0;
6. var $filedata = ''; //该变量只被类外部程序访问
7. var $gzfilename;
8. var $fp;
9. var $dirstr='';
10. /*
11. 返回文件的修改时间格式.
12. 只为本类内部函数调用.
13. */
14. function unix2dostime($unixtime = 0) {
15. $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
16. if ($timearray['year'] < 1980) {
17. $timearray['year'] = 1980;
18. $timearray['mon'] = 1;
19. $timearray['mday'] = 1;
20. $timearray['hours'] = 0;
21. $timearray['minutes'] = 0;
22. $timearray['seconds'] = 0;
23. }
24. return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
25. ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
26. }
27. /*
28. 初始化文件,建立文件目录,
29. 并返回文件的写入权限.
30. */
31. function startfile($path = 'faisun.zip'){
32. $this->gzfilename=$path;
33. $mypathdir=array();
34. do{
35. $mypathdir[] = $path = dirname($path);
36. }while($path != '.');
37. @end($mypathdir);
38. do{
39. $path = @current($mypathdir);
40. @mkdir($path);
41. }while(@prev($mypathdir));
42. if($this->fp=@fopen($this->gzfilename,"w")){
43. return true;
44. }
45. return false;
46. }
47. /*
48. 添加一个文件到 zip 压缩包中.
49. */
50. function addfile($data, $name){
51. $name = str_replace('\', '/', $name);
52. if(strrchr($name,'/')=='/') return $this->adddir($name);
53. $dtime = dechex($this->unix2dostime());
54. $hexdtime = 'x' . $dtime[6] . $dtime[7]
55. . 'x' . $dtime[4] . $dtime[5]
56. . 'x' . $dtime[2] . $dtime[3]
57. . 'x' . $dtime[0] . $dtime[1];
58. eval('$hexdtime = "' . $hexdtime . '";');
59. $unc_len = strlen($data);
60. $crc = crc32($data);
61. $zdata = gzcompress($data);
62. $c_len = strlen($zdata);
63. $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2);
64. //新添文件内容格式化:
65. $datastr = "PK";
66. $datastr .= ""; // ver needed to extract
67. $datastr .= ""; // gen purpose bit flag
68. $datastr .= ""; // compression method
69. $datastr .= $hexdtime; // last mod time and date
70. $datastr .= pack('v', $crc); // crc32
71. $datastr .= pack('v', $c_len); // compressed filesize
72. $datastr .= pack('v', $unc_len); // uncompressed filesize
73. $datastr .= pack('v', strlen($name)); // length of filename
74. $datastr .= pack('v', 0); // extra field length
75. $datastr .= $name;
76. $datastr .= $zdata;
77. $datastr .= pack('v', $crc); // crc32
78. $datastr .= pack('v', $c_len); // compressed filesize
79. $datastr .= pack('v', $unc_len); // uncompressed filesize
80. fwrite($this->fp,$datastr); //写入新的文件内容
81. $my_datastr_len = strlen($datastr);
82. unset($datastr);
83. //新添文件目录信息
84. $dirstr = "PK";
85. $dirstr .= ""; // version made by
86. $dirstr .= ""; // version needed to extract
87. $dirstr .= ""; // gen purpose bit flag
88. $dirstr .= ""; // compression method
89. $dirstr .= $hexdtime; // last mod time & date
90. $dirstr .= pack('v', $crc); // crc32
91. $dirstr .= pack('v', $c_len); // compressed filesize
92. $dirstr .= pack('v', $unc_len); // uncompressed filesize
93. $dirstr .= pack('v', strlen($name) ); // length of filename
94. $dirstr .= pack('v', 0 ); // extra field length
95. $dirstr .= pack('v', 0 ); // file comment length
96. $dirstr .= pack('v', 0 ); // disk number start
97. $dirstr .= pack('v', 0 ); // internal file attributes
98. $dirstr .= pack('v', 32 ); // external file attributes - 'archive' bit set
99. $dirstr .= pack('v',$this->datastr_len ); // relative offset of local header
100. $dirstr .= $name;
101. $this->dirstr .= $dirstr; //目录信息
102. $this -> file_count ++;
103. $this -> dirstr_len += strlen($dirstr);
104. $this -> datastr_len += $my_datastr_len;
105. }
106. function adddir($name){
107. $name = str_replace("\", "/", $name);
108. $datastr = "PK ";
109. $datastr .= pack("v",0).pack("v",0).pack("v",0).pack("v", strlen($name) );
110. $datastr .= pack("v", 0 ).$name.pack("v", 0).pack("v", 0).pack("v", 0);
111. fwrite($this->fp,$datastr); //写入新的文件内容
112. $my_datastr_len = strlen($datastr);
113. unset($datastr);
114. $dirstr = "PK ";
115. $dirstr .= pack("v",0).pack("v",0).pack("v",0).pack("v", strlen($name) );
116. $dirstr .= pack("v", 0 ).pack("v", 0 ).pack("v", 0 ).pack("v", 0 );
117. $dirstr .= pack("v", 16 ).pack("v",$this->datastr_len).$name;
118. $this->dirstr .= $dirstr; //目录信息
119. $this -> file_count ++;
120. $this -> dirstr_len += strlen($dirstr);
121. $this -> datastr_len += $my_datastr_len;
122. }//开源代码phpfensi.com
123. function createfile(){
124. //压缩包结束信息,包括文件总数,目录信息读取指针位置等信息
125. $endstr = "PK" .
126. pack('v', $this -> file_count) .
127. pack('v', $this -> file_count) .
128. pack('v', $this -> dirstr_len) .
129. pack('v', $this -> datastr_len) .
130. "";
131. fwrite($this->fp,$this->dirstr.$endstr);
132. fclose($this->fp);
133. }
134. }