/system/library/cache.php

<?php

final class Cache { 

	private $expire = 3600; 



  	public function __construct() {

		$files = glob(DIR_CACHE . 'cache.*');

		

		if ($files) {

			foreach ($files as $file) {

				$time = substr(strrchr($file, '.'), 1);



      			if ($time < time()) {

					if (file_exists($file)) {

						unlink($file);

						clearstatcache();

					}

      			}

    		}

		}

  	}



	public function get($key) {

		$files = glob(DIR_CACHE . 'cache.' . preg_replace('/[^A-Z0-9\._-]/i', '', $key) . '.*');



		if ($files) {

			$cache = file_get_contents($files[0]);

			

			return unserialize($cache);

		}

	}



  	public function set($key, $value) {

    	$this->delete($key);

		

		$file = DIR_CACHE . 'cache.' . preg_replace('/[^A-Z0-9\._-]/i', '', $key) . '.' . (time() + $this->expire);

    	

		$handle = fopen($file, 'w');



    	fwrite($handle, serialize($value));

		

    	fclose($handle);

  	}

	

  	public function delete($key) {

		$files = glob(DIR_CACHE . 'cache.' . preg_replace('/[^A-Z0-9\._-]/i', '', $key) . '.*');

		

		if ($files) {

    		foreach ($files as $file) {

      			if (file_exists($file)) {

					unlink($file);

					clearstatcache();

				}

    		}

		}

  	}

}

?>