authenticate.php

<?php
session_start();
// Change this to your connection info.
$DATABASE_HOST = 'localhost';
$DATABASE_USER = 'scolgwyk_fs6ah';
$DATABASE_PASS = '@12qwas12';
$DATABASE_NAME = 'scolgwyk_fs6_login';
// Try and connect using the info above.
$con = mysqli_connect($DATABASE_HOST, $DATABASE_USER, $DATABASE_PASS, $DATABASE_NAME);
if ( mysqli_connect_errno() ) {
	// If there is an error with the connection, stop the script and display the error.
	exit('Failed to connect to MySQL: ' . mysqli_connect_error());
}
// Now we check if the data from the login form was submitted, isset() will check if the data exists.
if ( !isset($_POST['username'], $_POST['password']) ) {
	// Could not get the data that should have been sent.
	exit('Please fill both the username and password fields!');
}
// Prepare our SQL, preparing the SQL statement will prevent SQL injection.
if ($stmt = $con->prepare('SELECT id, password FROM accounts WHERE username = ?')) {
	// Bind parameters (s = string, i = int, b = blob, etc), in our case the username is a string so we use "s"
	$stmt->bind_param('s', $_POST['username']);
	$stmt->execute();
	// Store the result so we can check if the account exists in the database.
	$stmt->store_result();
if ($stmt->num_rows > 0) {
	$stmt->bind_result($id, $password);
	$stmt->fetch();
	// Account exists, now we verify the password.
	// Note: remember to use password_hash in your registration file to store the hashed passwords.
	if ($_POST['password'] === $password) {
		// Verification success! User has loggedin!
		// Create sessions so we know the user is logged in, they basically act like cookies but remember the data on the server.
		session_regenerate_id();
		$_SESSION['username'] = true;
		$_SESSION['name'] = $_POST['username'];
		$_SESSION['id'] = $id;
	header('Location: logindone.php');
	} else {
		// Incorrect password
		echo "<script type='text/javascript'>alert('Invalid Usrename or Password!');
            document.location='outdone.php'</script>";
	}
} else {
	// Incorrect username
echo "<script type='text/javascript'>alert('Invalid Usrename or Password!');
            document.location='outdone.php'</script>";
    
}
	$stmt->close();
}
?>