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Extract the search term from google referer

$referer = strtolower($_SERVER['HTTP_REFERER']);
 
// Test if user comes from google
if (strpos($referer, 'google')) {
	// Delete all before &q=
    $tmp = substr($referer, strpos($referer, 'q='));		
 
    // Remove q=
	$tmp = substr($tmp, 2);
 
	// Remove everything after the next &
	if (strpos($tmp, '&')) {
		$tmp = substr($tmp, 0,strpos($tmp, '&'));
	}	
	// we have the results.
	$searchTerm = urldecode($tmp);
}

Takes the referer and extracts the search term, if user comes from google.

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