How can the PHP script be modified to handle cases where the requested file does not exist and a default file needs to be served instead?

To handle cases where the requested file does not exist and a default file needs to be served instead, we can use the `file_exists()` function to check if the requested file exists. If it does not exist, we can serve a default file instead. We can achieve this by setting a variable for the default file and using the `file_get_contents()` function to output the contents of the default file. 

<?php
$requested_file = $_GET['file'];
$default_file = 'default.html';

if (file_exists($requested_file)) {
    // Serve the requested file
    echo file_get_contents($requested_file);
} else {
    // Serve the default file
    echo file_get_contents($default_file);
}
?>

Keywords

PHP file_exists file_get_contents header HTTP 404

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