extraer todas las imagenes asociadas de un post

galería wp

<h1><?php the_title() ?></h1>

<?php
        $images = get_children( array( 'post_parent' => $post->ID, 'post_type' => 'attachment', 'post_mime_type' => 'image', 'orderby' => 'menu_order', 'order' => 'ASC', 'numberposts' => 999 ) );
        if ( $images ) :
?>
            <?php foreach($images as $ima): ?>
                        <div class="gallery-thumb ev-gallery">
                                <a rel="ev-gallery" class="size-thumbnail" href="<?php echo wp_get_attachment_url($ima->ID); ?>"><?php echo wp_get_attachment_image( $ima->ID, 'thumbnail' ); ?></a>                               
                        </div>
            <?php endforeach;
            ?>

<?php   endif; ?>