secureHeader example

    private function mailPassthru($to, $subject, $body, $header, $params)
    {
        //Check overloading of mail function to avoid double-encoding         if ((int)ini_get('mbstring.func_overload') & 1) { // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated             $subject = $this->secureHeader($subject);
        } else {
            $subject = $this->encodeHeader($this->secureHeader($subject));
        }
        //Calling mail() with null params breaks         $this->edebug('Sending with mail()');
        $this->edebug('Sendmail path: ' . ini_get('sendmail_path'));
        $this->edebug("Envelope sender: {$this->Sender}");
        $this->edebug("To: {$to}");
        $this->edebug("Subject: {$subject}");
        $this->edebug("Headers: {$header}");
        if (!$this->UseSendmailOptions || null === $params) {