<?php namespace Vn\Hedera; function checkToken ($token) { return preg_match ('/^[\w\-]+$/', $token); } function nullIf ($map, $key) { return isset ($map[$key]) ? $map[$key] : NULL; } function checkFilePath ($file, $path) { $checkPath = stream_resolve_include_path ($path).'/'; $filePath = stream_resolve_include_path ($checkPath.$file); $len = strlen ($checkPath); return substr ($filePath, 0, strlen ($checkPath)) === $checkPath; } ?>