gistfile1.txt

function accessible_slick_shortcode($atts) {
    $atts = shortcode_atts([
        'imgid' => ''
    ], $atts);
    
    $img_ids = explode(',', $atts['imgid']);
    
    if (empty($img_ids)) {
        return '<p>No images found.</p>';
    }
    
    ob_start();
    ?>
    <div class="slider-wrap accessible-slick">
        <?php foreach ($img_ids as $img_id) :
            $img_id = trim($img_id);
            $img_url = wp_get_attachment_url($img_id);
            $img_alt = get_post_meta($img_id, '_wp_attachment_image_alt', true); // Fetch alt text
            if (!$img_alt) {
                $img_alt = get_the_title($img_id); // If alt text is empty, use the image title
            }
            if ($img_url) : ?>
                <div class="slider-images">
                    <img src="<?php echo esc_url($img_url); ?>" class="img-fluid" alt="<?php echo esc_attr($img_alt); ?>">
                </div>
            <?php endif; 
        endforeach; ?>
    </div>
    <?php
    return ob_get_clean();
}
add_shortcode('accessible-slick', 'accessible_slick_shortcode');

Usage -[accessible-slick imgid="23,13,55,556"]