Помогите написать маленький скрипт

$emails = file('base.txt');
$total = count($emails);

if (isset($_POST['submit'])) {
    $subject = isset($_POST['subject']) ? trim(htmlspecialchars($_POST['subject'])) : null;
    $text = isset($_POST['text']) ? trim(htmlspecialchars($_POST['text'])) : null;
    if (empty($text && $subject)) {
        echo '<p>Заполните все поля! <a href="?">Назад</a></p>';
    } else {
        require_once('KMail.php');
        $mail = new KMail;
        for ($i = 0; $i < $total; $i++) {
            $mail->add_to($emails[$i]);
            $mail->set_subject($subject);
            $mail->add_body_message($text);
            $mail->send();
        }
        echo '<p>Рассылка успешно завершена! <a href="?">К форме</a></p>';
    }
} else {
echo '<form method="post">
    <p>Тема рассылки:</p>
    <input type="text" name="subject">
    <p>Текст рассылки:</p>
    <textarea name="text"></textarea><br>
    <input type="submit" name="submit" value="Разослать">
    </form>';

echo '<p>Всего email-получателей: ' . $total . '</p>';
}

<?php
class KMail {
 
    private $mb = false;
 
    private $header = false;
 
    private $subject = '(No subject)';
 
    private $to = array();
 
    private $body = ''; 
 
    public function __construct() {
        $this->set_mb();    
    }   
 
    public function send_mail_utf8($to, $subject, $message, $header) { 
        return mail($to, '=?UTF-8?B?' . base64_encode($subject) . '?=', $message, 'MIME-Version: 1.0' . PHP_EOL . $header); 
    }
 
    public function send() {
 
        if (!$this->get_mb()) {
            throw new Exception('Ошибка установки уникального значения');            
        }
 
        if (!$this->get_header()) {
            $this->set_header();
        }
 
        if (!$this->get_body()) {
            throw new Exception('Отсутсвует тело письма');        
        }
 
        if (sizeof($this->to) > 0) {
            foreach($this->to as $to) {
                $this->send_mail_utf8($to, $this->get_subject(), $this->get_body() . $this->end_body(), $this->get_header());
            }    
        } else {
            throw new Exception('Отсутствует адресат');    
        }
 
    }
 
    public function add_to($mail) {
        $this->to[] = $mail;    
    }
 
    public function add_body_message($text) {
        $this->body .= '--' . $this->mb . PHP_EOL . 
        'Content-Type: text/plain; charset="UTF-8"' . PHP_EOL . 
        'Content-Disposition: inline' . PHP_EOL . 
        'Content-Transfer-Encoding: base64' . PHP_EOL . PHP_EOL . 
        chunk_split(base64_encode($text)) . PHP_EOL;    
    }
 
    public function add_body_file($file_name, $file_stream) {
        $this->body .= PHP_EOL . '--' . $this->mb . PHP_EOL .
        'Content-Type: application/octet-stream; name="' . $file_name . '"' . PHP_EOL . 
        'Content-Disposition: attachment;' . PHP_EOL . 
        ' filename="' . $file_name . '"' . PHP_EOL . 
        'Content-Transfer-Encoding: base64' . PHP_EOL . PHP_EOL . chunk_split(base64_encode($file_stream));    
    }
 
    public function end_body() {
        return '--' . $mb . '--';    
    }
 
    public function get_body() {
        return $this->body;    
    }
 
    public function set_mb() {
        $this->mb = '_=_Multipart_Boundary_' . substr(md5(uniqid(time())), 0, 8);
    }
 
    public function set_subject($subject) {
        if ($subject) {
            $this->subject = $subject;
        }
    }
 
    public function get_subject() {
        return $this->subject;
    }
 
    public function get_mb() {
        return $this->mb;    
    }
 
    public function set_header($email = 'No reply') {
        $this->header = 'Content-Type: multipart/mixed; boundary="' . $this->get_mb() . '"' . PHP_EOL . 'X-Mailer: PHP' . PHP_EOL . 'Reply-To: ' . $email . PHP_EOL;    
    }
 
    public function get_header() {
        return $this->header;    
    }
 
}