public static function isValid($base, $value) { if (strpos($base, '.')) { list($table, $field) = explode('.', $base); $model = new Model(); $model->tableName = $table; $q = $model->Read("{$field} = '{$value}'"); if ($model->countResults() > 0) { return true; } else { return false; } } else { return false; } }