在php虚拟主机中启用gzip压缩的方法

3. define('ABSPATH', dirname(__FILE__).'/');

4. $cache = true;//Gzip压缩开关

5. $cachedir = 'gzip_cache/';//存放gz文件的目录，使用前创建，并赋予可写权限

6. $gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip');

7. $deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate');
8. $encoding = $gzip ? 'gzip' : ($deflate ? 'deflate' : 'none');

9. if(!isset($_SERVER['QUERY_STRING'])) exit();

10. $key=array_shift(explode('?', $_SERVER['QUERY_STRING']));

11. $key=str_replace('../','',$key);
12. $filename=ABSPATH.$key;
13. $symbol='^';
14. $rel_path=str_replace(ABSPATH,'',dirname($filename));
15. $namespace=str_replace('/',$symbol,$rel_path);
16. $cache_filename=ABSPATH.$cachedir.$namespace.$symbol.basename($filename).'.gz';//缓存路径
17. $type="Content-type: text/html"; //MIME信息
18. $ext = array_pop(explode('.', $filename));//获取文件扩展名

19. switch ($ext){//更新MIME信息

20. case 'css':
21. $type="Content-type: text/css";
22. break;
23. case 'js':
24. $type="Content-type: text/javascript";
25. break;
26. default:
27. exit();
28. }

29. if($cache){

30. if(file_exists($cache_filename)){//假如存在gz文件
32. $mtime = filemtime($cache_filename);
33. $gmt_mtime = gmdate('D, d M Y H:i:s', $mtime) . ' GMT';
35. if( (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
36. array_shift(explode(';', $_SERVER['HTTP_IF_MODIFIED_SINCE'])) == $gmt_mtime)
37. ){
39. // 若文件无变动，返回304
40. header ("HTTP/1.1 304 Not Modified");
41. header("Expires: ");
42. header("Cache-Control: ");
43. header("Pragma: ");
44. header($type);
45. header("Tips: Cache Not Modified (Gzip)");
46. header ('Content-Length: 0');

47. }else{

48. //读取gz文件输出

49. $content = file_get_contents($cache_filename);
50. header("Last-Modified:" . $gmt_mtime);
51. header("Expires: ");
52. header("Cache-Control: ");
53. header("Pragma: ");
54. header($type);
55. header("Tips: Normal Respond (Gzip)");
56. header("Content-Encoding: gzip");
57. echo $content;
58. }

59. }else if(file_exists($filename)){ //没有对应的gz文件

60. $mtime = mktime();

61. $gmt_mtime = gmdate('D, d M Y H:i:s', $mtime) . ' GMT';
63. $content = file_get_contents($filename);
64. $content = gzencode($content, 9, $gzip ? FORCE_GZIP : FORCE_DEFLATE);//压缩内容
66. header("Last-Modified:" . $gmt_mtime);
67. header("Expires: ");
68. header("Cache-Control: ");
69. header("Pragma: ");
70. header($type);
71. header("Tips: Build Gzip File (Gzip)");
72. header ("Content-Encoding: " . $encoding);
73. header ('Content-Length: ' . strlen($content));
74. echo $content;

75. if ($fp = fopen($cache_filename, 'w')) {//写入缓存

76. fwrite($fp, $content);
77. fclose($fp);
78. }

79. }else{

80. header("HTTP/1.0 404 Not Found");
81. }
82. }else{ //关闭Gzip压缩
83. //by bbs.it-home.org
84. if(file_exists($filename)){
85. $mtime = filemtime($filename);
86. $gmt_mtime = gmdate('D, d M Y H:i:s', $mtime) . ' GMT';
88. if( (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
89. array_shift(explode(';', $_SERVER['HTTP_IF_MODIFIED_SINCE'])) == $gmt_mtime)
90. ){
92. header ("HTTP/1.1 304 Not Modified");
93. header("Expires: ");
94. header("Cache-Control: ");
95. header("Pragma: ");
96. header($type);
97. header("Tips: Cache Not Modified");
98. header ('Content-Length: 0');
100. }else{
102. header("Last-Modified:" . $gmt_mtime);
103. header("Expires: ");
104. header("Cache-Control: ");
105. header("Pragma: ");
106. header($type);
107. header("Tips: Normal Respond");
108. $content = readfile($filename);
109. echo $content;
111. }
112. }else{
113. header("HTTP/1.0 404 Not Found");
114. }
115. }
116. ?>

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接着，在.htaccess(Apache mod_rewrite)或httpd.ini(IIS ISAPI_Rewrite)中添加以下规则：

2. RewriteRule (.*.css$|.*.js$) /gzip.php\?$1 [L]

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最后，进行测试。 访问网站的各个页面，看看gzip_cache文件夹中是否有缓存文件生成。 也可以用百度站长工具，可以看到css/js页面是否压缩。