login.inc.php

<?php
    session_start();
?>

<?php
include_once 'C:\xampp\htdocs\personal-website-php\includes\dbh.inc.php';
?>

<?php
    if(isset($_POST['login_submit'])){
        $username = $_POST['login_username'];
        $password = $_POST['login_password'];
        $successUrl = "portal.php";

        $usernameEmpty = false;
        $passwordEmpty = false;

        if(empty($username)){
            echo "<span class='form-error'>Please enter your username</span>";
            $usernameEmpty = true;
        }
        elseif (empty($password)){
            echo "<span class='form-error'>Please enter your password</span>";
            $passwordEmpty = true;
        }
        else{
            $sql = "SELECT members_password FROM tbl_members WHERE members_username=:username;";
            // Create prepared statement
            $stmt = $connection->prepare($sql);
            // Prepare statement
            $stmt->bindValue(':username', $username, PDO::PARAM_STR);

            $results = $stmt->execute();

            if($results){
                $user = $stmt->fetch();
                if($user) {
                    $passwordVerify = password_verify($password, $user['members_password']);
                    if($passwordVerify == false){
                        echo "<span class='form-error'>Login failed</span>";
                    }
                    else {
                        $_SESSION['username'] = $username;
                        header("Location: https://www.google.com");
                        exit;
                    }
                }
            }
            else {
                echo "<span class='form-success'>No account found, please register</span>";
            }
        }
    }
?>

<script>
    $(".login-username, .login-password").removeClass("input-error");

    var errorUserEmpty = "<?php echo $usernameEmpty; ?>";
    var errorPwEmpty = "<?php echo $passwordEmpty; ?>";

    if(errorUserEmpty == true) {
        $(".login-username").addClass("input-error");
    }
    if (errorPwEmpty == true){
        $(".login-password").addClass("input-error");
    }

    if(errorUserEmpty == false && errorPwEmpty == false){

    }
</script>