PHP一个小巧的缓存类

PHP一个小巧的缓存类

[PHP+MYSQL]

post by Uncle Liu / 2009-7-8 9:42 Wednesday
功能很简单，就是缓存整个页面，可以设定缓存时间，可以缓存特定的URL，例如：test.php?id=12，当目标文件更新时，如test.php，缓存文件也会更新，即使仍处于缓存期内。
PHP代码
1. <?php
2. class cache
3. {
4. var $cache_dir = './cache/';//This is the directory where the cache files will be stored;
5. var $cache_time = 180;//How much time will keep the cache files in seconds.
7. var $caching = false;
8. var $file = '';
10. function cache()
11. {
12. if(!file_exists($this->cache_dir))
13. {
14. mkdir($this->cache_dir);
15. }
16. //Constructor of the class
17. $this->file = $this->cache_dir . urlencode( $_SERVER['REQUEST_URI'] );
18. if(file_exists($this->file)) $expired = $this->check_expire();
19. else $expired = false;
20. if ( file_exists ( $this->file ) && ( filemtime ( $this->file ) + $this->cache_time ) > time() && !$expired )
21. {
22. //Grab the cache:
23. $handle = fopen( $this->file , "r");
24. do {
25. $data = fread($handle, 8192);
26. if (strlen($data) == 0) {
27. break;
28. }
29. echo $data;
30. } while (true);
31. fclose($handle);
32. exit();
33. }
34. else
35. {
36. //create cache :
37. $this->caching = true;
38. ob_start();
39. $now = time();
40. //echo "\n";
41. }
42. }
44. function close()
45. {
46. //You should have this at the end of each page
47. if ( $this->caching )
48. {
49. //You were caching the contents so display them, and write the cache file
50. $data = ob_get_clean();
51. echo $data;
52. $fp = fopen( $this->file , 'w' );
53. fwrite ( $fp , $data );
54. fclose ( $fp );
55. }
56. }
57. function check_expire(){
59. $modify_time = filemtime($this->file);
60. if($modify_time<filemtime($_SERVER['SCRIPT_FILENAME'])){
61. return true;
62. }
63. else{
64. return false;
65. }
67. }
68. }
72. //Example :
73. $ch = new cache();
74. echo 'test';
75. $ch->close();
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