Obfuscate string to prevent scraping / harvesting (e.g. e-mail addresses)

obfuscate.php

<?php
// -------------------------------------------------
// Kohana 3.0'dan alıntı
// HTML::obfuscate
// -------------------------------------------------
function obfuscate($string)
{
    $safe = '';
    foreach (str_split($string) as $letter)
    {
        switch (rand(1, 3))
        {
            // HTML entity code
            case 1:
                $safe .= '&#'.ord($letter).';';
            break;

            // Hex character code
            case 2:
                $safe .= '&#x'.dechex(ord($letter)).';';
            break;

            // Raw (no) encoding
            case 3:
                $safe .= $letter;
        }
    }

    return $safe;
}