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PHP - consecutive page visits
// first you need to set $last seen from the DB..
// first you need to set consecutive from the DB too..
// once you have, you can do something like this.
if(strtotime('-1 day', date('Y-m-d')) == $last_seen) {
    $consecutive = $consecutive + 1;
    mysql_query(sprintf('UPDATE user SET last_seen=NOW(),consecutive=%d WHERE id=%d', $consecutive + 1, $id));
} else if(date('Y-m-d') == $last_seen) {
    // ok, they logged in today again, do nothing.
} else {
    $consecutive = 0; // only really needed if you plan on displaying it to the user
                      // later in this script
    mysql_query(sprintf('UPDATE user SET last_seen=NOW(),consecutive=0 WHERE id=%d',$id));
}

if(isset($_COOKIE["identifier"])){
   // log as existing user
}else{
  setcookie('identifier', $id_value, ...
}