Send utf-8 email

<?php    
    function mail_utf8($to, $subject = '(No subject)', $message = '', $header = '') {
        $header_ = 'MIME-Version: 1.0' . "\r\n" . 'Content-type: text/html; charset=UTF-8' . "\r\n";
        return mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $message, $header_ . $header);
    }
    
    // Title Of Entry
    $title = "utf-8 string here";

    // Content Of Entry
    $content = "utf-8 string here...<br>Second Line<br>...";

    // Post entry by sending email
    $ret = mail_utf8('gmail-account.your-secret-phrase@blogger.com', $title, $content);
    echo $ret;
?>