WP_Site_Icon::additional_sizes( array $sizes = array() )

	public function additional_sizes( $sizes = array() ) {
		$only_crop_sizes = array();

		/**
		 * Filters the different dimensions that a site icon is saved in.
		 *
		 * @since WP-4.3.0
		 *
		 * @param array $site_icon_sizes Sizes available for the Site Icon.
		 */
		$this->site_icon_sizes = apply_filters( 'site_icon_image_sizes', $this->site_icon_sizes );

		// Use a natural sort of numbers.
		natsort( $this->site_icon_sizes );
		$this->site_icon_sizes = array_reverse( $this->site_icon_sizes );

		// ensure that we only resize the image into
		foreach ( $sizes as $name => $size_array ) {
			if ( isset( $size_array['crop'] ) ) {
				$only_crop_sizes[ $name ] = $size_array;
			}
		}

		foreach ( $this->site_icon_sizes as $size ) {
			if ( $size < $this->min_size ) {
				$only_crop_sizes[ 'site_icon-' . $size ] = array(
					'width ' => $size,
					'height' => $size,
					'crop'   => true,
				);
			}
		}

		return $only_crop_sizes;
	}