astra_get_blog_layout_class( string $class = '' )

	function astra_get_blog_layout_class( $class = '' ) {

		// array of class names.
		$classes = array();

		$post_format = get_post_format();
		if ( $post_format ) {
			$post_format = 'standard';
		}

		$classes[] = 'ast-post-format-' . $post_format;

		if ( ! has_post_thumbnail() || ! wp_get_attachment_image_src( get_post_thumbnail_id() ) ) {
			switch ( $post_format ) {

				case 'aside':
								$classes[] = 'ast-no-thumb';
					break;

				case 'image':
								$has_image = astra_get_first_image_from_post();
					if ( empty( $has_image ) || is_single() ) {
						$classes[] = 'ast-no-thumb';
					}
					break;

				case 'video':
								$post_featured_data = astra_get_video_from_post( get_the_ID() );
					if ( empty( $post_featured_data ) ) {
						$classes[] = 'ast-no-thumb';
					}
					break;

				case 'quote':
								$classes[] = 'ast-no-thumb';
					break;

				case 'link':
								$classes[] = 'ast-no-thumb';
					break;

				case 'gallery':
								$post_featured_data = get_post_gallery();
					if ( empty( $post_featured_data ) || is_single() ) {
						$classes[] = 'ast-no-thumb';
					}
					break;

				case 'audio':
								$has_audio = astra_get_audios_from_post( get_the_ID() );
					if ( empty( $has_audio ) || is_single() ) {
						$classes[] = 'ast-no-thumb';
					} else {
						$classes[] = 'ast-embeded-audio';
					}
					break;

				case 'standard':
				default:
					if ( ! has_post_thumbnail() || ! wp_get_attachment_image_src( get_post_thumbnail_id() ) ) {
						$classes[] = 'ast-no-thumb';
					}
					break;
			}
		}

		if ( ! empty( $class ) ) {
			if ( ! is_array( $class ) ) {
				$class = preg_split( '#\s+#', $class );
			}
			$classes = array_merge( $classes, $class );
		} else {
			// Ensure that we always coerce class to being an array.
			$class = array();
		}

		/**
		 * Filter primary div class names
		 */
		$classes = apply_filters( 'astra_blog_layout_class', $classes, $class );

		$classes = array_map( 'sanitize_html_class', $classes );

		return array_unique( $classes );
	}