Users Account Redirection - php

Question

I am creating a code that the user will redirect depends on their user type
I've tried if,else statement but there's some errors
"mysqli_stmt_bind_param(): Number of elements in type definition string doesn't match number of bind variables"
<?php
// Initialize the session
session_start();
// Include config file
require_once "config.php";
// Check if the user is already logged in, if yes then redirect him to
welcome page
if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){
if($_SESSION["userType"] == "administrator"){
header("location: index.php");
exit;
}else($_SESSION["userType"] == "user"){
header("location: userpage.php");
exit;
}
}
// Define variables and initialize with empty values
$username = $password = $userType = "";
$username_err = $password_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Check if username is empty
if(empty(trim($_POST["username"]))){
$username_err = "Please enter username.";
} else{
$username = trim($_POST["username"]);
}
// Check if password is empty
if(empty(trim($_POST["password"]))){
$password_err = "Please enter your password.";
} else{
$password = trim($_POST["password"]);
}
// Validate credentials
if(empty($username_err) && empty($password_err)){
// Prepare a select statement
$sql = "SELECT * FROM users WHERE username = ? and userType = ?";
if($stmt = mysqli_prepare($link, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "ss", $param_username);
// Set parameters
$param_username = $username;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
// Store result
mysqli_stmt_store_result($stmt);
// Check if username exists, if yes then verify password
if(mysqli_stmt_num_rows($stmt) == 1){
// Bind result variables
mysqli_stmt_bind_result($stmt, $id, $username,
$hashed_password, $userType);
if(mysqli_stmt_fetch($stmt)){
if(password_verify($password, $hashed_password)){
// Password is correct, so start a new session
session_start();
// Store data in session variables
$_SESSION["loggedin"] = true;
$_SESSION["id"] = $id;
$_SESSION["username"] = $username;
$_SESSION["userType"] = $userType;
} else{
// Display an error message if password is not valid
$password_err = "The password you entered was incorrect.";
}
}
}else{
// Display an error message if username doesn't exist
$username_err = "No account found with that username.";
}
} else{
echo "Oops! Something went wrong. Please try again later.";
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Close connection
mysqli_close($link);
}
?>
I'd like to see how to redirect the users depending on their user types.

Answer 1

You missed one argument on mysqli_stmt_bind_param()
So your code should be:
mysqli_stmt_bind_result($stmt, 'ss', $param_username, $user_type);
See https://www.php.net/manual/en/mysqli-stmt.bind-param.php