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coding for the rate calculation of dcs

if ($_GET['updatekg']==0) {

    $query = "SELECT * FROM `samudra` WHERE `date`='$_GET[date]' AND `status`='0' ";

    $res = mysqli_query($con, $query);

    while ($row = mysqli_fetch_assoc($res)) {

        $fatkg = ($row['fat'] * $row['qty']) / 100;

        $snfkg = ($row['snf'] * $row['qty']) / 100;

        if (3 <= $row['fat'] && $row['fat'] <= 5.4 ) {

            $queryrate = "SELECT * FROM `rate0` WHERE `fat`='$row[fat]' AND `snf`='$row[snf]'";

            $resrate = mysqli_query($con, $queryrate);

            if (mysqli_num_rows($resrate) != 0) {

                $rowrate = mysqli_fetch_assoc($resrate);

                $rate = $row['qty'] * $rowrate['rate'];

                $price=$rowrate['rate'];

            } else {

                if( $row['fat'] < 3.0 || $row['snf'] < 8.0){

                    $rate="0.0";

                    $price=0;

                }

                elseif(3 <= $row['fat'] && $row['fat'] <= 5.4 &&   8.5 <= $row['snf']){

                    $queryrate0 = "SELECT * FROM `rate0` WHERE `fat`='$row[fat]' AND `snf`='8.5'";

                $resrate0 = mysqli_query($con, $queryrate0);

                $rowrate0 = mysqli_fetch_assoc($resrate0);

                $rate = $row['qty'] * $rowrate0['rate'];

                $price=$rowrate0['rate'];

                }

                

            }

        } 

        elseif (5.5 <= $row['fat'] && $row['fat'] <= 7.9 ) {

            $queryrate = "SELECT * FROM `rate1` WHERE `fat`='$row[fat]' AND `snf`='$row[snf]'";

            $resrate = mysqli_query($con, $queryrate);

            if (mysqli_num_rows($resrate) != 0) {

                $rowrate = mysqli_fetch_assoc($resrate);

                $rate = $row['qty'] * $rowrate['rate'];

                $price=$rowrate['rate'];

            } else {

                if( $row['snf'] <= 8.4){

                    $rate="0.0";

                    $price=0;

                }

                elseif(5.5 <= $row['fat'] && $row['fat'] <= 5.9 && 8.8 < $row['snf']){

                    $queryrate0 = "SELECT * FROM `rate1` WHERE `fat`='$row[fat]' AND `snf`='8.8'";

                $resrate0 = mysqli_query($con, $queryrate0);

                $rowrate0 = mysqli_fetch_assoc($resrate0);

                $rate = $row['qty'] * $rowrate0['rate'];

                $price=$rowrate0['rate'];

                }

                elseif( 9.0 < $row['snf']){

                    $queryrate0 = "SELECT * FROM `rate1` WHERE `fat`='$row[fat]' AND `snf`='9.0'";

                $resrate0 = mysqli_query($con, $queryrate0);

                $rowrate0 = mysqli_fetch_assoc($resrate0);

                $rate = $row['qty'] * $rowrate0['rate'];

                $price=$rowrate0['rate'];

                }

                

            }

        } 

        elseif (8.0 <= $row['fat'] && $row['fat'] <= 10.0 ) {

            $queryrate = "SELECT * FROM `rate2` WHERE `fat`='$row[fat]' AND `snf`='$row[snf]'";

            $resrate = mysqli_query($con, $queryrate);

            if (mysqli_num_rows($resrate) != 0) {

                $rowrate = mysqli_fetch_assoc($resrate);

                $rate = $row['qty'] * $rowrate['rate'];

                $price=$rowrate['rate'];

            } else {

                if( $row['snf'] <= 8.4){

                    $rate="0.0";

                    $price=0;

                }

                elseif( 9.0 <= $row['snf']){

                    $queryrate0 = "SELECT * FROM `rate2` WHERE `fat`='$row[fat]' AND `snf`='9.0'";

                $resrate0 = mysqli_query($con, $queryrate0);

                $rowrate0 = mysqli_fetch_assoc($resrate0);

                $rate = $row['qty'] * $rowrate0['rate'];

                $price=$rowrate0['rate'];

                }

                

            }

        }

        $updatewa = "UPDATE `samudra` SET `fatkg`='$fatkg',`snfkg`='$snfkg',`rate`='$rate',`perprice`='$price',`status`='1' WHERE `id`='$row[id]'";

        mysqli_query($con, $updatewa);

    }

    echo "<script>window.location.href='index.php'</script>";

}

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