src/Storage/File.php
public function clear($uid = null) {
        if ($uid) {
            if (!$this->has($uid)) {
                return false;
            }
            return @unlink($this->dir . '/' . $uid);
        }
        array_map('unlink', Glob::glob($this->dir . '/*', 0));
        return true;
    }
public function clear($uid = null) {
        if ($uid) {
            if (!$this->has($uid)) {
                return false;
            }
            return @unlink($this->dir . '/' . $uid);
        }
        array_map('unlink', Glob::glob($this->dir . '/*', 0));
        return true;
    }
Clear datas with $uid key
@param mixed $uid
@return void