Possible to target banners to people coming from certain keywords?

Is it possible to create a script in php (or other) that could target a banner or other advertising to people coming from google through a certain keyword?

I want to show the banner for one product when people people visit my site through "Keyword A" to see one banner, and the people coming from "keyword b" to see a completely different banner ad. Like targeting the ads by what the visitor is searching for.

Can this be done?

 

Yes, you can utilize $_SERVER['HTTP_REFERER'] in this way.

For example a query 'video converter download' was searched, then the url will be something like:
"http://www.google.com/search?sourceid=navclient&aq=t&ie=UTF-8&rlz=1T4GGLJ_enPK279PK279&q=video+converter+download"

Now when it comes to your script:

$info = parse_url($_SERVER['HTTP_REFERER']);

if($info['host'] == 'www.google.com') {
    #good, utilize the keywords
    $pos = strpos($info['query'],"q=");
    if($pos === FALSE) {
          #handle error, no keywords
    }
         
    $keywords = substr($info['query'],$pos+2,1024);
    print $keywords;
}

Code (markup):

It will probably print something like

I hope it helps.

regards

 

Here you go, I just wrote this quickly.

Put this at the top of your file:

<?php
// Change this to your default banner if there are no keywords
$sBanner = '<img src="default.gif">';

// Change this to suit, the format is: 'keyword' => 'output'
$aBanners = array('test'  => '<img src="test.gif">',
                  'test2' => '<img src="test2.gif">'
                 );

if ( isset($_SERVER['HTTP_REFERER']) )
{
    $aUrl = parse_url($_SERVER['HTTP_REFERER']);
    switch($aUrl['host'])
    {
        case 'search.yahoo.com':
            $sVar = 'p';
        case 'search.live.com':
        case 'www.google.com':
        case 'google.com':
            $sVar = 'q';
            break; 
    } 
    
    if ( isset($sVar) )
    {
        $aQuery = explode('&', $aUrl['query']); 
        foreach($aQuery as $sQuery)
        {
            list($sName, $sValue) = explode('=', $sQuery);
                
            if ( $sName == $sVar )
            {
                $aKeywords = explode('+', $sValue);   
            }
        }
                     
        foreach($aKeywords as $sKeyword)
        {
            if ( array_key_exists($sKeyword, $aBanners) )
            {
                $sBanner = $aBanners[$sKeyword];
                break;
            }
        }
    }
}
?>

PHP:

Then where you want your banner displayed place this:

<?php echo $sBanner; ?>

PHP:

I hope that helps .

 

Very nice work. I will benifit many users surely.

regards

 

That looks awesome! cant wait to try it.

But a question. Now if a user visits from google initially through a keyword, but then clicks on another page inside my site. Will the visitor still see the correct ad if the referer is technically different?

Thanks!

 

No, this is only for the landing page but I could do that for you too, if you like?

 

clarky: Nice script, but perhaps instead of exploding by & and =, use the parse_str function designed for this, I would definitely recommend you use the second parameter.

Here's a link: http://php.net/manual/en/function.parse-str.php