PHPMailer\PHPMailer\SMTP::edebug PHP Метод

    protected function edebug($str, $level = 0)
    {
        if ($level > $this->do_debug) {
            return;
        }
        //Avoid clash with built-in function names
        if (!in_array($this->Debugoutput, ['error_log', 'html', 'echo']) and is_callable($this->Debugoutput)) {
            call_user_func($this->Debugoutput, $str, $this->do_debug);
            return;
        }
        switch ($this->Debugoutput) {
            case 'error_log':
                //Don't output, just log
                error_log($str);
                break;
            case 'html':
                //Cleans up output a bit for a better looking, HTML-safe output
                echo htmlentities(preg_replace('/[\\r\\n]+/', '', $str), ENT_QUOTES, 'UTF-8') . "<br>\n";
                break;
            case 'echo':
            default:
                //Normalize line breaks
                $str = preg_replace('/(\\r\\n|\\r|\\n)/ms', "\n", $str);
                echo gmdate('Y-m-d H:i:s') . "\t" . str_replace("\n", "\n                   \t                  ", trim($str)) . "\n";
        }
    }