Wordpress - How to get a post attachments and post attachment images: get_post_attachments() & get_post_attachment_images()

wp_get_post_attachments.php

<?php

function get_post_attachments($post_parent_id, $numberpost = -1, $posts_status = NULL)
{
    $args = array
    (
        'post_type'   => 'attachment',
        'numberposts' => $numberpost,
        'post_status' => $posts_status,
        'post_parent' => $post_parent_id
    );

    return get_posts($args);
}

function get_post_attachment_images($post_parent_id, $attr = NULL, $size = 'full', $posts_status = NULL)
{
    $attachment_images = array();
    $args = array
    (
        'post_type'   => 'attachment',
        'numberposts' => -1,
        'post_status' => $posts_status,
        'post_parent' => $post_parent_id
    );

    if ($attachments = get_posts($args))
    {
        foreach ($attachments as $attachment)
        {
            $attachment_images[] = wp_get_attachment_image($attachment->ID, $size, FALSE, $attr);
        }
    }

    return $attachment_images;
}

$query = new WP_Query($args);
if ($query->have_posts()) 
{
  while ($query->have_posts())
  {
    $query->the_post();
    
    $attributes  = array('class' => 'slider-small', 'alt' => esc_attr(get_the_title()));
    $attachments = get_post_attachment_images(get_the_ID(), $attributes);
    
    print_r($attachments);
  }
}