What is the difference between using PHP and JavaScript for random image loading on a website?

When using PHP for random image loading on a website, the images are selected and displayed on the server side before being sent to the client's browser. This means that the random image is determined each time the page is loaded. On the other hand, using JavaScript for random image loading means that the images are selected and displayed on the client side, allowing for dynamic changes without refreshing the entire page.

<?php
$images = array("image1.jpg", "image2.jpg", "image3.jpg", "image4.jpg");
$random_image = $images[array_rand($images)];
echo '<img src="' . $random_image . '" alt="Random Image">';
?>