How can PHP beginners implement a login system for their website effectively?

Issue: PHP beginners can implement a login system for their website effectively by creating a login form, validating user input, checking credentials against a database, and setting session variables upon successful login. 

<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Validate user input
    // Check credentials against a database
    // Set session variables upon successful login
}
?>

Keywords

PHP login system website authentication security

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