Unexpected result, I obtain always 0 in row[2]. Why? - php

Question

row[0] return giocatore’s field value
row1 return avversario’s field value
row[2] should return the values of “coins” field but it returns everytime value=0, WHY?
Here it is an image of the table, the fields and the values that row[2] is missing
Everytime I call the function coins() in a php script that I created, it always returns me the third value of the row array with value 0 (so row[2] always = 0) but when I check the value of it on php-MyAdmin using the same SQL instruction I obtain the correct values (different by 0). So why PHP is not using the right value with row[2]. The values of row[0] and row1 are always correct in php-MyAdmin and in the script results.
This is the SQL statement I created and it seems to work fine on php-MyAdmin:SELECT `giocatore`, `avversario`, `coins` FROM `tiri_dadi_table2` WHERE `contatore`= (SELECT MAX(`contatore`) FROM `tiri_dadi_table2`)
The database name: is tiri_dadi_db
The Table name is: tiri_dadi_table2
Columns names are: 'contatore' int(11), 'giocatore' int(11), 'avversario' int(11), coins int(11)
In php, as a result of the row[2] always equal to 0 I have always DB_coins = 0 at the beginning of the function in my script, so it's increased or decreased and then return to be 0 everytime.
It seems to be a scope problem but I'm not able to solve it at the moment.
Thank you in advance for your help.
(sorry for my bad english, I'm working on it! :)
function coins() {
/* Connect to the database */
$conn = new mysqli('localhost','root', '');
// Check connection
if ($conn->connect_error)
{
die("<br>Connessione fallita: " . $conn->connect_error);
}
//echo "<br>DB connesso con successo.<br>";
// Select database
mysqli_select_db($conn,"tiri_dadi_db");
// sql READING values
$sql = "SELECT `giocatore`, `avversario`, `coins` FROM `tiri_dadi_table2` WHERE `contatore`= (SELECT MAX(`contatore`) FROM `tiri_dadi_table2`)";
// on php-MyAdmin this SQL statement return me 3 correct values but here in the script, on the row[2] value there is always 0. Why??? Is a static problem or what?
if ($result = mysqli_query($conn, $sql)) {
// Fetch one and one row
while ($row = mysqli_fetch_row($result)) {
$last_roll_R = $row[0];
$last_roll_B = $row[1];
$DB_coins = $row[2]; // ...... but this is 0 everytime even though in SQL give me the correct value...
var_dump($row); // The var_dump($row) return me something like this:
// array(3) { [0]=> string(1) "2" [1]=> string(1) "4" [2]=> string(1) "0" }
}
// free memory
mysqli_free_result($result);
}
// close connection
mysqli_close($conn);
...
}