Send html emails in php using the mail function

<?php
// Source: http://www.binarytides.com/send-html-emails-php-mail-function/

function html_mail($to, $subject, $message, $options)
{
    if(isset($options['from_name']))
    {
        $headers = "From: " . $options['from_name'] . "<".$options['from_email'].">" . "rn";
    }
    $headers .= "Reply-To: ". strip_tags($_POST['req-email']) . "rn";
    //$headers .= "CC: someone@example.comrn";
    $headers .= "MIME-Version: 1.0rn";
    $headers .= "Content-Type: text/html; charset=ISO-8859-1rn";

    mail($to, $subject, $message, $headers);
}

$to = 'm00n.silv3r@gmail.com';
$subject = 'Welcome to website';
$from_name = 'Sunny';
$from_email = 'no-reply@example.com';

$message = '<html><body>';
$message .= '<table rules="all" style="border-color: #666;" cellpadding="10">';
$message .= "<tr style='background: #eee;'><td><strong>Name:</strong> </td><td>Silver Moon</td></tr>";
$message .= "<tr><td><strong>Email:</strong> </td><td>m00n.silv3r@gmail.com</td></tr>";
$message .= "<tr><td><strong>Location:</strong> </td><td>Moon</td></tr>";
$message .= "</table>";
$message .= "</body></html>";

html_mail($to, $subject, $message, array('from_email' => $from_email, 'from_name' => $from_name));