BP_Media_Extractor::extract_images_from_featured_images( string $richtext, string $plaintext, array $extra_args )

	protected function extract_images_from_featured_images( $richtext, $plaintext, $extra_args ) {
		$image = array();
		$thumb = 0;

		if ( isset( $extra_args['post'] ) ) {
			$thumb = (int) get_post_thumbnail_id( $extra_args['post']->ID );
		}

		if ( $thumb ) {
			// Validate the size of the images requested.
			if ( isset( $extra_args['width'] ) ) {
				if ( ! isset( $extra_args['height'] ) && ctype_digit( $extra_args['width'] ) ) {
					// A width was specified but not a height, so calculate it assuming a 4:3 ratio.
					$extra_args['height'] = round( ( $extra_args['width'] / 4 ) * 3 );
				}

				if ( ctype_digit( $extra_args['width'] ) ) {
					$image_size = array( $extra_args['width'], $extra_args['height'] );
				} else {
					$image_size = $extra_args['width'];  // E.g. "thumb", "medium".
				}
			} else {
				$image_size = 'full';
			}

			$image = wp_get_attachment_image_src( $thumb, $image_size );
		}

		/**
		 * Filters featured images extracted from a WordPress Post.
		 *
		 * @since BuddyPress 2.3.0
		 *
		 * @param array  $image      Extracted images. See {@link BP_Media_Extractor_Post::extract_images()} for format.
		 * @param string $richtext   Content to parse.
		 * @param string $plaintext  Copy of $richtext without any markup.
		 * @param array  $extra_args Bespoke data for a particular extractor.
		 */
		return apply_filters( 'bp_media_extractor_featured_images', $image, $richtext, $plaintext, $extra_args );
	}