Display image only if referred from certain URL

I would like to show a specific image to visitors of my site only if they've come from a specific URL (i.e. yahoo etc)

Thanks for your help.
phaygarthAsked:
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Andrej PirmanCommented:
Hi,

you can script some if() or case() requrements when image is shown, based on visitor's IP, which you get from variable:

$_SERVER["REMOTE_ADDR"]

for example:

$visitors_IP = $_SERVER["REMOTE_ADDR"];
$good_IP = array("11.22.33.44", "11.22.33.55", "11.22.33.66", "11.22.33.77");
if (in_array($visitors_IP, $good_IP)) {
    echo "<img src=\"image.gif\">";
}

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Andrej PirmanCommented:
Hmmm....reading your question second time, I was wondering if you want to filter visitors NOT by visitor's origin, but by which referrer was used.
This is more complicated.

first try this:

echo "you came from " . $HTTP_REFERER;

this variable is NOT generated by every PHP setup, so you depend on it to display referer.
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leakim971PluritechnicianCommented:
Hello phaygarth,

Try :


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script language="javascript">
	window.onload = function() {
		// get an array of reference on each picture
		var array_of_img = document.getElementsByTagName("img");
		// parse all pictures to check their src/url
		for( var i=0 ; i<array_of_img.length ; i++) {
			// if the url/src of the image don't start by http://domain or don't have http
			if( (array_of_img[i].src.indexOf('http://filedb.experts-exchange.com')!=0) || (array_of_img[i].src.indexOf('http://')==-1) ) {
				// set the src to a default/empty picture
				array_of_img[i].src = "http://www.lawrence.sd.us/images/nopic.gif";
			}
		}
	}
</script>
</head>
<body>
<img src="http://filedb.experts-exchange.com/incoming/2008/04_w17/19317/logo-Easter.jpg" />
<img src="http://www.google.fr/images/nav_logo8.png" />
</body>
</html>

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phaygarthAuthor Commented:
To help clarify my question:

If a visitor arrives on my site via a yahoo (eg) search result, then I would like to display 'image1.jpg' to them.

However, if they come from any other referrer, then I would like to display 'image2.jpg' to them (or no image at all)

Hope this makes sense.
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jet-blackCommented:
Here is the code:

<?php
if (isset($_SERVER['HTTP_REFERER']))
{
    $parseUrl = parse_url($_SERVER['HTTP_REFERER']);
    if ($parseUrl['host'] == "www.yahoo.com" || $parseUrl['host'] == "yahoo.com")
    {
        //user comes from yahoo.com
?>
<img width="65" height="37" border="0" src="//www.examplesite.com/imageYAHOO.gif" alt="blah">
<?php
    }
    else
    {
        //user comes from other site 
    ?>
<img width="65" height="37" border="0" src="//www.examplesite.com/imageOTHER.gif" alt="blah">
<?php
    }
}
else
{
    //user opened directly the page - no referrer set.
    //do something...
}
?>

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