Lexy::check_security PHP Method

    protected function check_security($code)
    {
        $tokens = token_get_all($code);
        $errors = array();
        foreach ($tokens as $index => $toc) {
            if (is_array($toc) && isset($toc[0])) {
                //var_dump($toc[0]);
                switch ($toc[0]) {
                    case T_STRING:
                        if (!in_array(strtolower($toc[1]), $this->allowed_calls)) {
                            $prevtoc = $tokens[$index - 1];
                            if (!isset($prevtoc[1]) || isset($prevtoc[1]) && $prevtoc[1] != '->') {
                                $errors[] = $toc[1];
                            }
                        }
                        break;
                    case T_REQUIRE_ONCE:
                    case T_REQUIRE:
                    case T_NEW:
                    case T_RETURN:
                    case T_BREAK:
                    case T_CATCH:
                    case T_CLONE:
                    case T_EXIT:
                    case T_PRINT:
                    case T_GLOBAL:
                    case T_INCLUDE_ONCE:
                    case T_INCLUDE:
                    case T_EVAL:
                    case T_FUNCTION:
                        if (!in_array(strtolower($toc[1]), $this->allowed_calls)) {
                            $errors[] = 'illegal call: ' . $toc[1];
                        }
                        break;
                }
            }
        }
        return count($errors) ? $errors : false;
    }