How can caching affect the display of an image with a random number in PHP?

Caching can affect the display of an image with a random number in PHP because the cached version of the image may not reflect the updated random number, leading to the same image being displayed instead of a new one. To solve this issue, you can append a unique query parameter to the image URL, such as a timestamp or a random number, to force the browser to fetch a fresh copy of the image each time. 

<?php
$random_number = mt_rand(); // generate a random number
$image_url = 'image.jpg?' . $random_number; // append the random number as a query parameter
?>

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

Keywords

caching image display random number PHP performance

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