Warning: fread(): Length parameter must be greater than 0

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	}

	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');

		flock($handle, LOCK_EX);

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

		fflush($handle);

		flock($handle, LOCK_UN);

		fclose($handle);
	}