[WP Rocket] Clear cache once for certain hooks.

wp-rocket_inc_Engine_Preload_Subscriber.php

'after_rocket_clean_domain_outside_the_loop'  => 'clean_full_cache',

wp-rocket_inc_functions_files.php

function rocket_clean_domain( $lang = '', $filesystem = null ) {
	$urls = ( ! $lang || is_object( $lang ) || is_array( $lang ) || is_int( $lang ) )
		? (array) get_rocket_i18n_uri()
		: (array) get_rocket_i18n_home_url( $lang );

	/**
	 * Filter URLs to delete all caching files from a domain.
	 *
	 * @since 2.6.4
	 *
	 * @param array     URLs that will be returned.
	 * @param string    The language code.
	 */
	$urls = (array) apply_filters( 'rocket_clean_domain_urls', $urls, $lang );
	$urls = array_filter( $urls );
	if ( empty( $urls ) ) {
		return false;
	}

	/** This filter is documented in inc/front/htaccess.php */
	$url_no_dots      = (bool) apply_filters( 'rocket_url_no_dots', false );
	$cache_path       = _rocket_get_wp_rocket_cache_path();
	$dirs_to_preserve = get_rocket_i18n_to_preserve( $lang, $cache_path );

	if ( empty( $filesystem ) ) {
		$filesystem = rocket_direct_filesystem();
	}

	foreach ( $urls as $url ) {
		$parsed_url = get_rocket_parse_url( $url );

		if ( $url_no_dots ) {
			$parsed_url['host'] = str_replace( '.', '_', $parsed_url['host'] );
		}

		$root = $cache_path . $parsed_url['host'] . $parsed_url['path'];

		/**
		 * Fires before all cache files are deleted.
		 *
		 * @since 1.0
		 *
		 * @param string $root The path of home cache file.
		 * @param string $lang The current lang to purge.
		 * @param string $url  The home url.
		 */
		do_action( 'before_rocket_clean_domain', $root, $lang, $url ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals

		foreach ( _rocket_get_cache_dirs( $parsed_url['host'], $cache_path ) as $dir ) {
			$entry = $dir . $parsed_url['path'];
			// Skip if the dir/file does not exist.
			if ( ! $filesystem->exists( $entry ) ) {
				continue;
			}

			if ( $filesystem->is_dir( $entry ) ) {
				rocket_rrmdir( $entry, $dirs_to_preserve, $filesystem );
			} else {
				$filesystem->delete( $entry );
			}
		}

		/**
		 * Fires after all cache files was deleted.
		 *
		 * @since 1.0
		 *
		 * @param string $root The path of home cache file.
		 * @param string $lang The current lang to purge.
		 * @param string $url  The home url.
		 */
		do_action( 'after_rocket_clean_domain', $root, $lang, $url ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals
	}

	/**
	 * This is custom hook introduced by WPML team tok
	 */
	do_action( 'after_rocket_clean_domain_outside_the_loop' );

	return true;
}