$mail = new PHPMailer();
$mail->CharSet = 'utf-8';

$email_body = "";
$email_body = $email_body . "<p>Имя:</p><h2>".$name."</h2><p>Телефон:</p><h2>".$phone."</h2><p>Email:</p><h2>".$email."</h2>";

$uploadfile = tempnam(sys_get_temp_dir(), sha1($_FILES['file']['name']));
$filename = $_FILES['myfile']['name'];
if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadfile)) {
    $mail->addAttachment($uploadfile, $filename);
}