encode-email-address.php

<?php
// http://www.paulund.co.uk/encode-email-with-php

/**
 * Encode an email address to display on your website
 */
function encode_email_address( $email ) {
     $output = '';
     for ($i = 0; $i < strlen($email); $i++)
     {
          $output .= '&#'.ord($email[$i]).';';
     }
     return $output;
}

$encodedEmail = encode_email_address( 'example@domain.com' );
printf('<a href="mailto:%s">%s</a>', $encodedEmail, $encodedEmail);