How can the PHP code be optimized to ensure proper authentication and redirection based on user login status and form submissions?

To ensure proper authentication and redirection based on user login status and form submissions, we can optimize the PHP code by checking the user's login status before allowing access to certain pages or actions. We can also implement form submission handling to validate user input and redirect accordingly. 

<?php
session_start();

// Check if user is logged in
if(!isset($_SESSION['user_id'])) {
    header("Location: login.php");
    exit;
}

// Handle form submission
if($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form data
    // Redirect based on form data
}

// Continue with page content for authenticated users
?>

Keywords

PHP authentication redirection form submissions optimization

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