after upgrade to new version, in the top show this error

Code: Select all

<?php
final class Cache {
	private $expire = 7200;

	public function get($key) {
		$files = DIR_CACHE . 'cache.' . $key;

		if(file_exists($files) AND filemtime($files) > (time() - $this->expire)) {
			$cache = file_get_contents($files);
			clearstatcache();
			return unserialize($cache);
		}
	}

	public function set($key, $value) {
		$file = DIR_CACHE . 'cache.' . $key;
		file_put_contents($file, serialize($value));
	}

	public function delete($key) {
		$files = glob(DIR_CACHE . 'cache.' . $key . '*');

		if ($files) {
			foreach ($files as $file) {
				if(is_writable($file)) {
					file_put_contents($file, '');
					@unlink($file);
					clearstatcache();
				}
			}
		}
	}

}