Récupérer moteur, mot clé et page de la provenance du visiteur

analyse_seo.php

<?php
function analyse($ref){
	$refe = parse_url($ref);
	parse_str($refe['query'], $query);
	$host = $refe['host'];

	switch ($host){
		//GOOGLE
		case (strpos($host, '.google.') !== false):
			$moteur = "Google";
			$mot_cle = $query['q'];
			$page = $query['start'];
			if (!$page){
				$page = 1;
			} else {
				$page = ($page / 10) + 1;
			}
		break;
		//Yahoo
		case (strpos($host, '.yahoo.') !== false):
			$moteur = "Yahoo";
			$mot_cle = $query['p'];
			$page = $query['b'];
			if (!$page){
				$page = 1;
			} else {
				$page = (($page - 1) / 10) + 1;
			}
		break;
		//Bing
		case (strpos($host, '.bing.') !== false):
			$moteur = "Bing";
			$mot_cle = $query['q'];
			$page = $query['first'];
			if (!$page){
				$page = 1;
			} else {
				$page = (($page - 1) / 10) + 1;
			}
		break;
		
	}
	return array(
	'moteur' => stripslashes($moteur) ,
	'mot' => stripslashes($mot_cle) ,
	'page' => stripslashes($page)
	);

}
echo '<pre>';
var_dump(analyse($_SERVER['HTTP_REFERER']));