emailcustomencoder.php

<?php

function tep_rewrite_email($content) {
    $email_patt = '([A-Za-z0-9._%-]+)\@([A-Za-z0-9._%-]+)\.([A-Za-z0-9._%-]+)';
    $mailto_pattern = '#\<a[^>]*?href=\"mailto:\s?' . $email_patt . '[^>]*?\>[^>]*?<\/a\>#';
    $rewrite_result = '<span class="mailme">\\1 AT \\2 DOT \\3</span>';

    $content = preg_replace($mailto_pattern, $rewrite_result, $content);
    $content = preg_replace('#' . $email_patt . '#', $rewrite_result, $content);

    return $content;
}

?>

PHP function that finds emails in the given output and converts them to {{holder}} AT {{domain}} DOT {{zone}} format. I have created this function to fight against spam bots. The idea was to convert output into this custom format on the Backend side printing this into HTML page and then find, parse printed HTML element with JavaScript to encode it back to human-readable email format.

Example:
echo tep_rewrite_email('email@example.com');
// Prints <span class="mailme">email AT example DOT com</span>