How can one create independent sections on a webpage in PHP without using frames?

To create independent sections on a webpage in PHP without using frames, you can utilize PHP include function to include separate files for each section of the webpage. This allows you to maintain separate files for each section and include them dynamically on the main webpage.

<!-- index.php -->
<!DOCTYPE html>
<html>
<head>
    <title>Independent Sections</title>
</head>
<body>

<?php include 'header.php'; ?>

<div>
    <h1>Main Content Section</h1>
    <p>This is the main content of the webpage.</p>
</div>

<?php include 'footer.php'; ?>

</body>
</html>
```

```php
<!-- header.php -->
<header>
    <h1>Header Section</h1>
    <nav>
        <ul>
            <li><a href="#">Home</a></li>
            <li><a href="#">About</a></li>
            <li><a href="#">Contact</a></li>
        </ul>
    </nav>
</header>
```

```php
<!-- footer.php -->
<footer>
    <p>© 2021 My Website. All Rights Reserved.</p>
</footer>