What are the advantages of using timestamp or random numbers in PHP image generation for cache management?

When generating images dynamically in PHP, it's important to implement cache management to improve performance. One common approach is to use timestamps or random numbers in the image URL to force browsers to fetch a new version when the image changes. This helps prevent browsers from caching outdated images and ensures users always see the latest version. 

<?php
// Generate a unique image URL with timestamp
$image_url = 'image.php?timestamp=' . time();

// Output image tag with the unique URL
echo '<img src="' . $image_url . '" alt="Dynamic Image">';
?>

Keywords

timestamp random numbers PHP image generation cache management advantages

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