Xp and leveling system PHP MYSQL

Question

Ive looked at all the question that have been asked and with the answer, but i cannot seem to find a answer that suits me the best. What im trying to do is work on making a system that when a user is at a certain xp limit that go to the next level. and it shows how much xp is needed till the next xp.

So

lvl1 = 0 => lvl2 = 256 => lvl3 = 785 => lvl4 = 1656 => lvl5 = 2654

how would i go about doing that, so if xp is at certain amount show the amount and how much xp is needed for the next level.

Answer 1

You can try something like this:

We have users_xp table in our db, with user_xp_id (primary key - auto increment), user_id and user_xp_amount (default value: 0) fields. When we want to update the user xp amount we should do it like:

$mysqli = new mysqli('localhost', 'my_user', 'my_password', 'my_db');

function update_user_xp($user_id, $amount, $mysqli) {
    $mysqli->query("UPDATE users_xp 
                    SET user_xp_amount=user_xp_amount+" . $amount . " 
                    WHERE user_id='$user_id'");
}

// we call this function like:
update_user_xp(4, 10, $mysqli); // user_id: 4, update with 10 points

when we want to get the actual user xp amount we can get it from our db table

function get_user_xp($user_id, $mysqli) {
    $sql = $mysqli->query("SELECT user_xp_amount 
                           FROM users_xp 
                           WHERE user_id='$user_id'");
   $row = $sql->fetch_assoc();
   return $row['user_xp_amount'];

}

$xp = array('lvl1' => 0, 'lvl2' => 256, 'lvl3' => 785, 'lvl4' => 1656, 'lvl5' => 2654);

$my_xp = get_user_xp(4, $mysqli); // where 4 is my user id

for($i = 0; $i < count($xp); $i++) {
   if($my_xp == $xp[$i]) {
       echo 'I\'m on level ', ($i+1);
       break;
   }
   else {
       if(isset($xp[$i+1])) {
           if($my_xp > $xp[$i] && $my_xp <= $xp[$i + 1]) {
               echo 'My next level is ', ($i+2), ' and I need ', $xp[$i+1], ' more points for achieving it!';
               break;
            } else {
               echo 'My next level is ', ($i+1), ' and I need ', $xp[$i], ' more points for achieving it!';
               break;
            }
        }
    }
}

Later edit:

CREATE TABLE `my_db_name`.`users_xp` (
`user_xp_id` BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`user_id` BIGINT NOT NULL ,
`user_xp_amount` BIGINT NOT NULL DEFAULT '0'
) ENGINE = InnoDB;