private static function guess_url( $assoc_args ) {
		if ( isset( $assoc_args['blog'] ) ) {
			$assoc_args['url'] = $assoc_args['blog'];
		}

		if ( isset( $assoc_args['url'] ) ) {
			$url = $assoc_args['url'];
			if ( true === $url ) {
				WP_CLI::warning( 'The --url parameter expects a value.' );
			}
		}

		if ( isset( $url ) ) {
			return $url;
		}

		return false;
	}