It’s a known fact that regular visitors don’t click on ads. Those who do click on ads are, 90% of the time, visitors coming from search engines.
Another problem is Google’s “smart pricing.” Being smart priced means that your click-through rate (CTR) is low and the money you earn per click is divided by between 2 and 10. For example, if a click would normally earn you $1.00, with smart pricing it could earn you as little as $0.10. Painful, isn’t it? Happily, this solution displays your AdSense ads to search engine visitors only, which means more clicks and a higher CTR.
The solution.
Open the functions.php file in your theme.
Paste the following code in it:
function scratch99_fromasearchengine(){
$ref = $_SERVER['HTTP_REFERER'];
$SE = array('/search?', 'images.google.', 'web.info.com', 'search.', 'del.icio.us/search', 'soso.com', '/search/', '.yahoo.');
foreach ($SE as $source) {
if (strpos($ref,$source)!==false) return true;
}
return false;
}
Once done, paste the following code anywhere in your template where you want your AdSense ads to appear. They’ll be displayed only to visitors coming from search engine results:
if (function_exists('scratch99_fromasearchengine')) {
if (scratch99_fromasearchengine()) {
INSERT YOUR <a title="See also REGEX - Find unclosed img tags" href="http://www.whileifblog.com/2010/08/31/regex-find-unclosed-img-tags/">CODE</a> HERE
}
}
Code explanation. This hack starts with the creation of a function called scratch99_fromasearchengine(). This function contains a $SE array variable in which you can specify search engines. You can easily add new search engines by adding new elements to the array.
The scratch99_fromasearchengine() then returns true if the visitor comes from one of the search engines containing the $SE array variable.
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