How can unique IDs be implemented in PHP to differentiate the content displayed by an image script on different websites?

To differentiate the content displayed by an image script on different websites, unique IDs can be implemented by generating a random string or using a hashing algorithm to create a unique identifier for each website. This unique ID can then be appended to the image URL as a query parameter, allowing the script to display different content based on the ID. 

<?php
// Generate a unique ID for each website
$unique_id = md5($_SERVER['HTTP_HOST']);

// Append the unique ID to the image URL
$image_url = "https://example.com/image.jpg?id=" . $unique_id;

// Display the image
echo "<img src='$image_url' alt='Unique Image'>";
?>

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