What are the alternatives to using frames in PHP for creating dynamic and responsive web pages?

Using frames in PHP for creating dynamic and responsive web pages is not recommended due to various limitations and drawbacks such as SEO issues, accessibility problems, and difficulty in maintaining and updating the content. Instead, you can use modern web development techniques like CSS grid, Flexbox, and media queries to create dynamic and responsive layouts without relying on frames.

<!DOCTYPE html>
<html>
<head>
    <title>Dynamic and Responsive Web Page</title>
    <style>
        /* CSS code for creating dynamic and responsive layout */
        .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            grid-gap: 20px;
        }

        @media screen and (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div>Content 1</div>
        <div>Content 2</div>
        <div>Content 3</div>
        <div>Content 4</div>
    </div>
</body>
</html>