please anyone can help me to solve the problem, am new to php development field

am developing investment interest portal, am getting problem to store interest rate daily based into database, the actual problem is to store interest with user details, am using cron job to run function for every 24hours its working perfect but when i am login as user its storing that user's interest rate values only , other user not storing, i think am using session user logged details maybe this problem, please can anyone help me to store every users interest value with user details

    session_start();
    $_SESSION['sess_user'];
    $conn = mysqli_connect("localhost", "root", "", "bitmining");

    $investedusername = $_SESSION['sess_user']; 
    $sql3="SELECT sum(inv_amount) as total FROM buyinvest WHERE invested_username='$investedusername'";         

    $result = mysqli_query($conn, $sql3);           
    while($row = mysqli_fetch_assoc($result)){

        $investment = $row['total'];
        $days = 1;
        $interest_rate = (350/100/365) * $days ;
        $finalvalue = $interest_rate * $days;

    } 

    $date = "SELECT invest_timestamp FROM buyinvest ORDER BY invest_timestamp DESC LIMIT 1";
    $result = mysqli_query($conn, $date);
    $d_test = mysqli_fetch_assoc($result);

    $d_test2 = $d_test["invest_timestamp"];

    $timestamp = time();

    $investeduser = $_SESSION['sess_user'];
    $interestamount = $finalvalue;  
    $date_interest = date("y-m-d h:i:s");

    if ($d_test2  + 86400 == $timestamp){
        if ($conn){
                $sql3 = "INSERT INTO user_investments(invested_user, interest_amount, date_interest) VALUES('$investeduser','$interestamount','$date_interest')";
                if (mysqli_query($conn, $sql3))
                {
                    echo "Updated!";
                }
                else
                {
                    echo "There is an error.";
                }
            }
        }
        else {
        echo "Not yet!";
        }

please anyone help me to solve above code

invest模型生境质量报错

Scarlett

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