How can caching affect the functionality of PHP scripts that handle background image changes?

Caching can affect the functionality of PHP scripts that handle background image changes by serving outdated cached versions of the images instead of the updated ones. To solve this issue, you can append a query string with a unique identifier to the image URL each time it is changed. This will force the browser to fetch the updated image instead of using the cached version. 

<?php
$imageUrl = 'background.jpg';
$uniqueIdentifier = time(); // Generate a unique identifier (can be a timestamp)

echo '<div style="background-image: url(' . $imageUrl . '?v=' . $uniqueIdentifier . ');"></div>';
?>

Keywords

caching PHP scripts background image changes functionality performance

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