<?php



	// Create connection to XAMPP and its DB
	$connection = mysqli_connect('localhost', 'root', '');
	if(!$connection)
	{
		die("Database connection failed".mysqli_error($connection));
	}
	$select_db = mysqli_select_db($connection, 'fleadbv2');
	if (!$select_db)
	{
    	die("Database Selection Failed" . mysqli_error($connection));
    }
    // Get values passed from the html page
	$username = $_POST['loginusername'];
	$password = $_POST['loginpassword'];
	$login = "SELECT * FROM users WHERE username='$username' AND password='$password'";

	session_start();

	// Query the database
	$result = mysqli_query($connection, $login);
	// Places results in an array
	$row = mysqli_fetch_array($result);
	if ($row['username']==$username && $row['password']==$password)
	{
		echo "Welcome, ".$username;
	}
	else
	{
		echo "Login failed. Please check your credentials.";
	}
?>

Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in C:\xampp\htdocs\ProjectFlea\login.php on line 26
Login failed. Please check your credentials.