What is the significance of including a random, unique parameter in the image URL when dealing with caching issues in PHP?

When dealing with caching issues in PHP, including a random, unique parameter in the image URL helps to bypass the cache and ensure that the latest version of the image is always displayed. This technique forces the browser to fetch the image from the server each time, preventing it from serving a cached version. 

<?php
$imageUrl = 'image.jpg';
$randomParam = '?v=' . uniqid();
$finalUrl = $imageUrl . $randomParam;
?>

<img src="<?php echo $finalUrl; ?>" alt="Image">

Keywords

PHP caching unique parameter image URL random

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