Re: [PHP] echo text - anti-spam-spider measure

[Jochem Maas]

Stut wrote:
> John Taylor-Johnston wrote:
>> Neat, and thnaks.
>> How spam-spider-proof is it? I will try this though.
>> But I will also try it with "mailto:"; in entities as well.
>> Thanks!
>> John
>>
>> <!-- HERE ARE THE ENTITIES -->
>> <a
>> href="mailto:&#109;&#101;@&#115;&#111;&#109;&#101;&#119;&#104;&#101;&#114;&#101;.&#99;&#111;&#109;";>&#109;&#101;@&#115;&#111;&#109;&#101;&#119;&#104;&#101;&#114;&#101;.&#99;&#111;&#109;</a>
>>
>> <!--ENTITIES ABOVE!-->
> 
> Of all the possible methods, entities are the easiest for bots to
> handle. They just need to decode the entities.

in the past I found the following to be annoying enough for harvesters not to 
bother:


function obsfucateString($str)
{
    $ret = '';
    for ($i=0;$i<strlen($str);++$i)
       $ret.= (mt_rand(0,1) ? '&#x'.sprintf("%X",ord($str{$i})) : 
'&#'.ord($str{$i})).';';

    return $ret;
}

no idea if it's still even remotely useful.

> 
> More reliable methods involve using javascript to write out the mailto:
> tag. Do it in several statements. But even then, some of the smarter
> spiders will execute simple javascript like that. You can make it better
> by using onload to execute the javascript which means the spider will
> need to implement that, which I don't believe they do at the moment.
> 
> Of course the best way is to use an image and don't link it. If it's
> just a way for visitors to contact you, use a contact form. You don't
> expose the email address and can control it a lot better.
> 
> -Stut
> 

-- 
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php