_media_states( WP_Post $post )

function _media_states( $post ) {
	$media_states = array();
	$stylesheet = get_option('stylesheet');

	if ( current_theme_supports( 'custom-header') ) {
		$meta_header = get_post_meta($post->ID, '_wp_attachment_is_custom_header', true );

		if ( is_random_header_image() ) {
			$header_images = wp_list_pluck( get_uploaded_header_images(), 'attachment_id' );

			if ( $meta_header == $stylesheet && in_array( $post->ID, $header_images ) ) {
				$media_states[] = __( 'Header Image' );
			}
		} else {
			$header_image = get_header_image();

			// Display "Header Image" if the image was ever used as a header image
			if ( ! empty( $meta_header ) && $meta_header == $stylesheet && $header_image !== wp_get_attachment_url( $post->ID ) ) {
				$media_states[] = __( 'Header Image' );
			}

			// Display "Current Header Image" if the image is currently the header image
			if ( $header_image && $header_image == wp_get_attachment_url( $post->ID ) ) {
				$media_states[] = __( 'Current Header Image' );
			}
		}
	}

	if ( current_theme_supports( 'custom-background') ) {
		$meta_background = get_post_meta($post->ID, '_wp_attachment_is_custom_background', true );

		if ( ! empty( $meta_background ) && $meta_background == $stylesheet ) {
			$media_states[] = __( 'Background Image' );

			$background_image = get_background_image();
			if ( $background_image && $background_image == wp_get_attachment_url( $post->ID ) ) {
				$media_states[] = __( 'Current Background Image' );
			}
		}
	}

	if ( $post->ID == get_option( 'site_icon' ) ) {
		$media_states[] = __( 'Site Icon' );
	}

	if ( $post->ID == get_theme_mod( 'custom_logo' ) ) {
		$media_states[] = __( 'Logo' );
	}

	/**
	 * Filters the default media display states for items in the Media list table.
	 *
	 * @since WP-3.2.0
	 * @since WP-4.8.0 Added the `$post` parameter.
	 *
	 * @param array   $media_states An array of media states. Default 'Header Image',
	 *                              'Background Image', 'Site Icon', 'Logo'.
	 * @param WP_Post $post         The current attachment object.
	 */
	$media_states = apply_filters( 'display_media_states', $media_states, $post );

	if ( ! empty( $media_states ) ) {
		$state_count = count( $media_states );
		$i = 0;
		echo ' — ';
		foreach ( $media_states as $state ) {
			++$i;
			( $i == $state_count ) ? $sep = '' : $sep = ', ';
			echo "<span class='post-state'>$state$sep</span>";
		}
	}
}