On Nov 16, 2010, at 5:25 PM, Daniel P. Brown wrote:
> On Tue, Nov 16, 2010 at 16:29, ash@xxxxxxxxxxxxxxxxxxxx
> <ash@xxxxxxxxxxxxxxxxxxxx> wrote:
>> Sorry for top post on phone.
>>
>> Depending on the type of site and location an email address might be legally required. For example, a business website in the UK requires a value email address to be made accessible to all your visitors, which includes blind people, so no image-only addresses.
>>
>> Spam is just a fact of life now, and the only real method of protection is a decent spam filter.
>
>
> <?php
>
> /**
> * Just hacked this together for your usage now. It's
> * a very basic implementation of a graphical display
> * of an email address (or any text, for that matter).
> * This can still easily be picked up by harvesters that
> * employ OCR, but beggars cannot be choosers. Well,
> * they can, but they really shouldn't. I mean, seriously,
> * there they are, just hoping and praying for a handout,
> * and when it finally comes, they bitch and moan that
> * I don't have any apples that didn't fall into the
> * sewer and sit there for a week that one time I donated
> * food to the food kitchen because I wanted this girl
> * to like me but it turned out she was a lesbian so
> * I just wasted the gas in the first place and my
> * car smelled like homeless people and crap-flavored
> * apples for three weeks.
> */
> function drawEmail($email) {
>
> /**
> * Set the width/height of the image.
> */
> $im = imagecreate(220,20);
>
> /**
> * Define the colors to be used, using RGB values.
> */
> $black = imagecolorallocate($im,0,0,0);
> $white = imagecolorallocate($im,255,255,255);
>
> /**
> * Fill the image with a chosen color.
> */
> imagefill($im,0,0,$white);
>
> /**
> * Calculate the text size to be used.
> */
> $px = (((imagesx($im) - 7.5) * strlen($string)) / 2);
>
> /**
> * Write $email in calculated size with chosen color.
> */
> imagestring($im,3,$px,9,$email,$black);
>
> /**
> * Output the image.
> */
> header("Content-type: image/png");
> imagepng($im);
>
> /**
> * Garbage clean-up, pass-through the status bool.
> */
> return imagedestroy($im);
> }
>
> drawEmail('danbrown@xxxxxxx');
>
> ?>
This approach uses javascript and can only be harvested if the harvesters fully render and implement javascript which I have yet to hear of.
Put in a js file:
/*
Scripts to render and address
*/
<script language="JavaScript" >
function display_email(name,domain) {
//U+0040 @â commercial at (64decimal, HTML: @)
document.write(name + '\x40' + domain);
}
function echo_mailto(name,domain,subj,italics) {
document.write('<a href="mailto:');
display_email(name,domain);
if (subj) {
document.write('?subject=' + subj);
}
document.write('">')
if (italics) {
document.write('<i>');
}
display_email(name,domain);
if (italics) {
document.write('</i>');
}
document.write('</a>');
}
</script>
To use:
<?php
echo "<script language=\"JavaScript\">echo_mailto('$yourname','$yourdomain','Feedback',true);</script>";
?>
which displays in italics an active mailto link to yourname@yourdomain
This is not harvestable unless a harvester renders javascript which I have yet to hear of and it meets Ash's comment about legal requirements.
I would reco to add in a spam trap or two to every page and forward them to spam harvesters.
Tom
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