Get Wordpress image in ACF style array.

functions.php

<?php

function my_image($image_id) {
    // Optional placeholder image
    // if (! $image_id) {
    //     return get_field('placeholder', 'option');
    // }

    $img_sizes = get_intermediate_image_sizes();

    $image = [
        'url' =>  wp_get_attachment_image_src($image_id, 'full')[0],
        'title' => get_the_title($image_id),
        'alt' => get_post_meta($image_id, '_wp_attachment_image_alt', true),
        'caption' => wp_get_attachment_caption($image_id),
        'sizes' => [],
    ];

    foreach ($img_sizes as $size) {
        $src = wp_get_attachment_image_src($image_id, $size);

        $image['sizes'][$size] = $src[0];
        $image['sizes'][$size . '-width'] = $src[1];
        $image['sizes'][$size . '-height'] = $src[2];
    }

    return $image;
}