Updating value into database - php

Question

I have problem in updating the value into my database. The problem here is that the when i am updating the data for all rows, the data from last row will be updated into the first row. Other rows will not be updated including the last row.
Below is my code for updating...
$sql = "SELECT * FROM product where username = '$username'";
$result = mysqli_query($con, $sql) or die(mysqli_error($con));
$rows = mysqli_fetch_array($result);
$id = $rows['pro_id'];
$boxid = $rows['box_id'];
$name = $_POST['pro_name'];
$quan = $_POST['pro_quan'];
$sold = $_POST['pro_sold'];
for ($i = 0; $i < count($_POST['pro_name']); $i++)
{
$sql = "UPDATE product
SET pro_name = '" . $name[$i] . "',
pro_quan = " . $quan[$i] . ",
pro_sold = " . $sold[$i] . "
WHERE pro_id = " . $id . "
AND box_id = '" . $boxid . "' ";
$results=mysqli_query($con, $sql);
}
So, i have no ideas what have gone wrong. Thanks for helping

Answer 1

You need to place the result in a loop.
Something like that:
$sql = "SELECT * FROM product where username = '$username'";
$result = mysqli_query($con, $sql) or die(mysqli_error($con));
while ($rows = mysqli_fetch_array($result))
{
$id = $rows['pro_id'];
$boxid = $rows['box_id'];
$name = $_POST['pro_name'];
$quan = $_POST['pro_quan'];
$sold = $_POST['pro_sold'];
for ($i = 0; $i < count($_POST['pro_name']); $i++)
{
$sql = "UPDATE product
SET pro_name = '" . $name[$i] . "',
pro_quan = " . $quan[$i] . ",
pro_sold = " . $sold[$i] . "
WHERE pro_id = " . $id . "
AND box_id = '" . $boxid . "' ";
$results = mysqli_query($con, $sql);
}
}