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Simple PHP cache class

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A simple class to cache files (or other results) with PHP.

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  1. <?php
  2. /**
  3.  * Class Cache
  4.  * 
  5.  * @author Koen Ekelschot
  6.  * @license WTFPL
  7.  */
  8. class Cache {
  9.  
  10. 	private $cachedFile;
  11.  
  12. 	public function __construct($identifier) {
  13. 		$this->cachedFile = ROOT.DS.'tmp'.DS.'cache'.DS.md5($identifier);
  14. 	}
  15.  
  16. 	public function cacheExists($maxAge) {
  17. 		if (file_exists($this->cachedFile) && !is_dir($this->cachedFile)) {
  18. 			if (filemtime($this->cachedFile) + $maxAge > time()) {
  19. 				return true;
  20. 			} else {
  21. 				$this->invalidateCache();
  22. 			}
  23. 		}
  24. 		return false;
  25. 	}
  26.  
  27. 	public function getCachedCopy() {
  28. 		$contents = file_get_contents($this->cachedFile);
  29. 		return unserialize(base64_decode($contents));
  30. 	}
  31.  
  32. 	public function getCachedFilename() {
  33. 		return str_replace(ROOT, '', $this->cachedFile);
  34. 	}
  35.  
  36. 	public function cacheResult($result) {
  37. 		if (file_exists($this->cachedFile) && !is_dir($this->cachedFile)) {
  38. 			$this->invalidateCache();
  39. 		}
  40. 		$base64 = base64_encode(serialize($result));
  41. 		file_put_contents($this->cachedFile, $base64);
  42. 	}
  43.  
  44. 	private function invalidateCache() {
  45. 		unlink($this->cachedFile);
  46. 	}
  47.  
  48. }
  49. ?>

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