WP_Customize_Header_Image_Setting::update( mixed $value ): true

38	public function update( $value ) {39		global $custom_image_header;40 41		// If _custom_header_background_just_in_time() fails to initialize $custom_image_header when not is_admin().42		if ( empty( $custom_image_header ) ) {43			require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';44			$args                   = get_theme_support( 'custom-header' );45			$admin_head_callback    = $args[0]['admin-head-callback'] ?? null;46			$admin_preview_callback = $args[0]['admin-preview-callback'] ?? null;47			$custom_image_header    = new Custom_Image_Header( $admin_head_callback, $admin_preview_callback );48		}49 50		/*51		 * If the value doesn't exist (removed or random),52		 * use the header_image value.53		 */54		if ( ! $value ) {55			$value = $this->manager->get_setting( 'header_image' )->post_value();56		}57 58		if ( is_array( $value ) && isset( $value['choice'] ) ) {59			$custom_image_header->set_header_image( $value['choice'] );60		} else {61			$custom_image_header->set_header_image( $value );62		}63		return true;64	}