Advanced custom field - gallery - display one random image

Question

I created a gallery with the "gallery add-on" of "advanced custom field" plugin.

I'm trying to show one random image from the gallery on page refresh. Here's my code:

<?php

    $gallery = get_field('gallery_home');           
    $rand = array_rand($gallery, 1);

        if( $rand ): ?>

            <img src="<?php echo $image['url']; ?>" alt="<?php echo $image['alt']; ?>" />

<?php endif; ?>

But the result is this:

<img src="" alt="">

Where am I missing something?

Answer 1

Shouldn't you be doing something like this?

<img src="<?php echo $rand['url']; ?>" alt="<?php echo $rand['alt']; ?>" />

Update

I'm not really familiar with that plugin (stuff could be happening behind the scenes) but here's a better guess than my previous one:

<?php
$gallery = get_field('gallery_home');
$rand = array_rand($gallery, 1);

if( $gallery ): ?>
    <img src="<?php echo $gallery[$rand]['url']; ?>" alt="<?php echo $gallery[$rand]['alt']; ?>" />
<?php endif; ?>