Featured Grid Content - Clean Box

function clean_box_page_grid_content( $options ) {
    $quantity       = $options['featured_grid_content_number'];

    global $post;

    $clean_box_page_grid_content = '';
    $number_of_page         = 0;        // for number of pages
    $page_list              = array();  // list of valid page ids

    //Get number of valid pages
    for( $i = 1; $i <= $quantity; $i++ ){
        if( isset ( $options['featured_grid_content_page_' . $i] ) && $options['featured_grid_content_page_' . $i] > 0 ){
            $number_of_page++;

            $page_list  =   array_merge( $page_list, array( $options['featured_grid_content_page_' . $i] ) );
        }

    }

    if ( !empty( $page_list ) && $number_of_page > 0 ) {
        $get_featured_posts = new WP_Query( array(
            'posts_per_page'    => $quantity,
            'post_type'         => 'page',
            'post__in'          => $page_list,
            'orderby'           => 'post__in'
        ));

        $i=1;

        while ( $get_featured_posts->have_posts() ) {

            $get_featured_posts->the_post();

            $title_attribute = the_title_attribute( array( 'before' => __( 'Permalink to:', 'clean-box' ), 'echo' => false ) );

            $classes = 'page pageid-' . $post->ID;

            if ( 1 == $i ) {
                $classes .= ' first-cols';
            }

            $clean_box_page_grid_content .=
            '<a class="grid-box '. $classes .'" title="' . $title_attribute . '" href="' . get_permalink() . '">';

            if ( has_post_thumbnail() ) {
                if ( 1 == $i ) {
                    $clean_box_page_grid_content .= get_the_post_thumbnail( $post->ID, 'clean-box-featured-grid', array( 'title' => esc_attr( $title_attribute ), 'alt' => esc_attr( $title_attribute ), 'class'    => 'pngfix' ) );
                }
                else{
                    $clean_box_page_grid_content .= get_the_post_thumbnail( $post->ID, 'clean-box-featured-content', array( 'title' => esc_attr( $title_attribute ), 'alt' => esc_attr( $title_attribute ), 'class' => 'pngfix' ) );
                }
            }
            else {
                //Default value if there is no first image
                $clean_box_image =
                    '<img class="no-image pngfix" src="'.get_template_directory_uri().'/images/gallery/no-featured-image-800x450.jpg" />';

                //Get the first image in page, returns false if there is no image
                $clean_box_first_image = clean_box_get_first_image( $post->ID, 'medium', array( 'title' => esc_attr( $title_attribute ), 'alt' => esc_attr( $title_attribute ), 'class' => 'pngfix' ) );

                //Set value of image as first image if there is an image present in the post
                if ( '' != $clean_box_first_image ) {
                    $clean_box_image =  $clean_box_first_image;
                }

                $clean_box_page_grid_content .= $clean_box_image;
            }

            $clean_box_page_grid_content .= '
                <div class="caption">
                    <span class="vcenter">
                        <span class="entry-title">
                            ' . the_title('', '', false) . '
                        </span>
                        <span class="more">';

                        $clean_box_page_grid_content .=  $options['excerpt_more_text'];

                $clean_box_page_grid_content .= '
                        </span><!-- .more -->
                    </span><!-- .vcenter -->
                </div><!-- .caption -->
            </a><!-- .grid-box -->';

            $i++;
        }

        wp_reset_query();
    }

    return $clean_box_page_grid_content;
}