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

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

.

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