What considerations should be made when deciding between separate desktop and mobile versions of a PHP website versus a responsive design approach?

When deciding between separate desktop and mobile versions of a PHP website versus a responsive design approach, considerations should include the maintenance of multiple codebases, potential SEO implications, user experience consistency, and development time and cost. 

// Example of implementing a responsive design approach in PHP using CSS media queries

<!DOCTYPE html>
<html>
<head>
    <title>Responsive Design Example</title>
    <style>
        body {
            font-family: Arial, sans-serif;
        }
        
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        
        @media only screen and (max-width: 600px) {
            .container {
                max-width: 100%;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Welcome to our responsive website!</h1>
        <p>This website will adjust its layout based on the screen size.</p>
    </div>
</body>
</html>

Keywords

responsive design media queries user agent detection viewport meta tag adaptive images

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