What is the best way to change a background image on a webpage using PHP?

To change a background image on a webpage using PHP, you can dynamically set the background image URL in the CSS file based on a certain condition or variable. This can be achieved by echoing out the CSS code within the HTML document using PHP. 

<?php
// Check for a condition to determine the background image URL
$background_image_url = "path/to/new/background/image.jpg";
?>

<!DOCTYPE html>
<html>
<head>
    <style>
        body {
            background-image: url(<?php echo $background_image_url; ?>);
            /* Additional CSS properties for the background */
        }
    </style>
</head>
<body>
    <!-- Content of the webpage -->
</body>
</html>

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