can't login

// LOGIN.PHP


<h1>Login</h1>

<form method="POST">
    <input style="width: 200px;" type="text" name="username"><br />
    <input style="width: 200px;" type="password" name="password"><br />
    <input style="width: 200px; margin-top: 10px;" type="submit"><br />
    <a href="register.php">Register</a>
</form>

<?php
    error_reporting(0);

    session_start();
        if(isset($_POST['username'], $_POST['password'])) {
            require 'core/connect.php';

            $query = dbConnect()->prepare("SELECT username, password FROM users WHERE username=:username AND password=:password");
            $query->bindParam(':username', $_POST['username']);
            $query->bindParam(':password', ($_POST['password']));
            $query->execute();

            if($row = $query->fetch()) {
                $_SESSION['username'] = $row['username'];
                $_SESSION['password'] = $row['password'];
                header("Location: index.php");
            } else {
                echo '<p style="color: red;">Invalid username/password</p>';
            }
        }
?>











// REGISTER.PHP


<h1>Register</h1>

<form method="POST">
    <input style="margin-bottom: 5px;" type="text" name="username" placeholder="Username" required><br />
    <input style="margin-bottom: 5px;" type="password" name="password" placeholder="Password" required><br />
    <input style="margin-bottom: 5px;" type="password" name="cpassword" placeholder="Confirm Password" required><br />
    <input style="margin-bottom: 10px;" type="email" name="email" placeholder="Email Address" required><br />
    <input style="width: 175px;" type="submit">
</form>

<?php
session_start();

    if(isset($_POST['username'], $_POST['password'], $_POST['cpassword'], $_POST['email'])){
        require 'core/connect.php';

        error_reporting(0);

        $username = $_POST['username'];
        $password = $_POST['password'];
        $cpassword = $_POST['cpassword'];
        $email = $_POST['email'];

        $query = dbConnect()->prepare("INSERT INTO users (username, password, cpassword, email) VALUES (:username, :password, :cpassword, :email)");
        $query->bindParam(':username', $_POST['username']);
        $query->bindParam(':password', password_hash($_POST['password'], PASSWORD_BCRYPT));
        $query->bindParam(':cpassword', password_hash($_POST['cpassword'], PASSWORD_BCRYPT));
        $query->bindParam(':email', $_POST['email']);

        // Check to make sure username is no less then 6 characters,
        // and is no more then 25 characters.
        if(strlen($username)<6 || strlen($username)>25) {
            echo '<p style="color: red;">Username must be between 6 and 25 characters</p>';

        } elseif($password != $cpassword) {
            // If password fields don't match - show the following error
            echo '<p style="color: red;">Passwords do not match</p>';

        } elseif(strlen($password)<8 || strlen($cpassword)<8) {
            // If password field is less then 8 characters show this error:
            echo '<p style="color: red;">Password must be at least 8 characters</p>';

        } else {
            // If no errors are found, write credentials to database
            $query->execute();
            header("Location: index.php");
        }
    }
?>