Please help, how can i get the actual value of "Balance" from the following code.

Question

$res = mysqli_query ($link, "SELECT Balance FROM restration WHERE username = '...';

Answer 1

next line of code:
$row = $res->fetch_assoc();
echo $row['Balance'];

If multiple rows are returned:
while($row = $res->fetch_assoc()) {
echo $row['Balance']."<br />";
}

Answer 2

http://www.tizag.com/mysqlTutorial/mysql-php-sql-injection.php

Answer 3

thank you brother

Answer 4

How about safety of these code over mysql injection?