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PHP cache class

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Release： 2016-07-25 09:09:58
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  1. define('CACHE_ROOT', dirname(__FILE__).'/cache'); //Cache storage directory
  2. define('CACHE_TIME', 1800); //Cache time unit seconds
  3. define( 'CACHE_FIX','.html');
  4. $CacheName=md5($_SERVER['REQUEST_URI']).CACHE_FIX; //Cache file name
  5. $CacheDir=CACHE_ROOT.'/'.substr($CacheName,0,1 );//Cache file storage directory
  6. $CacheUrl=$CacheDir.'/'.$CacheName;//The complete path of the cache file
  7. //The cache is only cached after GET request. After POST, you generally want to see the latest results
  8. if ($_SERVER['REQUEST_METHOD']=='GET'){
  9. //If the cache file exists and has not expired, read it out.
  10. if(file_exists($CacheName) && time()-filemtime($CacheName) $fp=fopen($CacheName,'rb');
  11. fpassthru($fp);
  12. fclose($fp) ;
  13. exit;
  14. }
  15. //Check whether the folder exists, create it if it does not exist
  16. elseif(!file_exists($CacheDir)){
  17. if(!file_exists(CACHE_ROOT)){
  18. mkdir(CACHE_ROOT,0777);
  19. chmod (CACHE_ROOT,0777);
  20. }
  21. mkdir($CacheDir,0777);
  22. chmod($CacheDir,0777);
  23. }
  24. //Callback function, this function is automatically called when the program ends
  25. function AutoCache($contents){
  26. global $CacheUrl;
  27. $fp=fopen($CacheUrl,'wb');
  28. fwrite($fp,$contents);
  29. fclose($fp);
  30. chmod($CacheUrl,0777);
  31. //Generate new While caching, all old caches are automatically deleted to save space and can be ignored.
  32. //DelOldCache();
  33. return $contents;
  34. }
  35. function DelOldCache(){
  36. chdir(CACHE_ROOT);
  37. foreach (glob("*/*".CACHE_FIX) as $file){
  38. if(time() -filemtime($file)>CACHE_TIME)unlink($file);
  39. }
  40. }
  41. //Callback function auto_cache
  42. ob_start('AutoCache');
  43. }else{
  44. //Delete the cache file if it is not a GET request.
  45. if(file_exists($CacheUrl))unlink($CacheUrl);
  46. }
  47. ?>
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PHP 缓存类
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