What is the purpose of using array_rand() in PHP for banner rotation?

When implementing banner rotation in PHP, using array_rand() can help randomly select a banner from an array of banner images. This function allows for a dynamic rotation of banners each time the page is loaded, providing variety and potentially increasing user engagement with the banners.

$bannerImages = ['banner1.jpg', 'banner2.jpg', 'banner3.jpg', 'banner4.jpg'];
$randomBanner = $bannerImages[array_rand($bannerImages)];
echo '<img src="' . $randomBanner . '" alt="Banner">';