Data is not inserted PHP Mysql XAMPP

I’ve searched many hours on the net and found nothing.
Please check my code and let me know if there is any problem and how should I get the error if there is any because I don’t get any and all steps go successful but data is not inserted .

I m using XAMPP by the way.

My db connection source :

<?php 
$dbhost = 'localhost:3307';
$dbuser = 'root';
$dbpass = '';
$dbname = 'website';
$conn = mysqli_connect($dbhost,$dbuser,$dbpass,$dbname);
if(!$conn) {
    die("<br><p style='color:red;font-size:35px;' >Database not connected !</p>");
}
?>

My source code :

<?php session_start();
if(!isset($_POST['sb'])){
    echo "<div style='margin:auto;width:max-content;color:red;font-family:IRANSans;margin-top:30px'>Oops! Access denied !</div>";
}
else{
    require "../DB/db.php";
    $fl = $_POST['1'];
    $national_id = $_POST['2'];
    $company = $_POST['3'];
    $phone = $_POST['4'];
    $mail = $_POST['5'];
    $password = $_POST['6'];
    if (empty($fl)){
        header("Location: /register?error=emptyName");
        exit();
    }
    if (empty($national_id)){
        header("Location: /register?error=emptyID");
        exit();
    }
    if (empty($company)){
        header("Location: /register?error=emptyCompany");
        exit();
    }
    elseif (empty($phone)){
        header("Location: /register?error=emptyPhone");
        exit();
    }
    elseif (empty($mail)){
        header("Location: /register?error=emptyEmail");
        exit();
    }
    elseif (!filter_var($mail , FILTER_VALIDATE_EMAIL)) {
        header("Location: /register?error=invalidEmailFormat");
        exit();
    }
    elseif (empty($password)){
        header("Location: /register?error=emptyPass");
        exit();
    }
    else{
        $sql = "SELECT * FROM users WHERE mail = ?";
        $stmt = mysqli_stmt_init($conn);
        if(!mysqli_stmt_prepare($stmt , $sql)){
            header("Location: /register?error=SQLNotPrepare1");
            exit();
        }
        else{
            mysqli_stmt_bind_param($stmt , "s" , $mail);
            mysqli_stmt_execute($stmt);
            mysqli_stmt_store_result($stmt);
            $rowcount = mysqli_stmt_num_rows($stmt);
            if($rowcount > 0){
                header("Location: /register?error=mailTaken");
                exit();
            }
            else{
                $sql = "INSERT INTO users(fname_lname,national_id,company,phone,mail,password) VALUES(?,?,?,?,?,?)";
                $stmt = mysqli_stmt_init($conn);
                if(!mysqli_stmt_prepare($stmt , $sql)){
                    header("Location: /register?error=SQLNotPrepare2");
                    exit();
                }
                else{
                    $_SESSION['starttime'] = time();
                    $hased_pass = password_hash($password , PASSWORD_DEFAULT);
                    mysqli_stmt_bind_param($stmt , "ssssss" , $fl,$national_id,$company,$phone,$hased_pass);
                    mysqli_stmt_execute($stmt);
                    header("Location: /register?register=success");
                    exit();
                }
            }
        }
    }
    mysqli_stmt_close($stmt);
    mysqli_close($conn);
}
?>

>Solution :

Here:

mysqli_stmt_bind_param($stmt , "ssssss" ,  $fl,$national_id,$company,$phone,$hased_pass); 

you have 6 s characters, but only 5 parameter variables. Turn on the error reporting as I’ve described above, and PHP will show you an error message about that!

You forgot to supply the $mail variable, by the looks of it. I think

mysqli_stmt_bind_param($stmt ,"ssssss" , $fl, $national_id, $company, $phone, $mail,  $hased_pass); 

is what you intended.