wp_load_translations_early

 * @global int $blog_id
 *
 * @return int Site ID.
 */
function get_current_blog_id() {
	global $blog_id;
	return absint( $blog_id );
}

/**
 * Retrieves the current network ID.
 *
 * @since 4.6.0
 *
 * @return int The ID of the current network.
 */
function get_current_network_id() {
	if ( ! is_multisite() ) {
		return 1;
	}

	$current_network = get_network();

	if ( ! isset( $current_network->id ) ) {
		return get_main_network_id();
	}

	return absint( $current_network->id );
}

/**
 * Attempt an early load of translations.
 *
 * Used for errors encountered during the initial loading process, before
 * the locale has been properly detected and loaded.
 *
 * Designed for unusual load sequences (like setup-config.php) or for when
 * the script will then terminate with an error, otherwise there is a risk
 * that a file can be double-included.
 *
 * @since 3.4.0
 * @access private
 *
 * @global WP_Locale $wp_locale WordPress date and time locale object.
 */
function wp_load_translations_early() {
	global $wp_locale;

	static $loaded = false;
	if ( $loaded ) {
		return;
	}
	$loaded = true;

	if ( function_exists( 'did_action' ) && did_action( 'init' ) ) {
		return;
	}

	// We need $wp_local_package.
	require ABSPATH . WPINC . '/version.php';

	// Translation and localization.
	require_once ABSPATH . WPINC . '/pomo/mo.php';
	require_once ABSPATH . WPINC . '/l10n.php';
	require_once ABSPATH . WPINC . '/class-wp-locale.php';
	require_once ABSPATH . WPINC . '/class-wp-locale-switcher.php';

	// General libraries.
	require_once ABSPATH . WPINC . '/plugin.php';

	$locales   = array();
	$locations = array();

	while ( true ) {
		if ( defined( 'WPLANG' ) ) {
			if ( '' === WPLANG ) {
				break;
			}
			$locales[] = WPLANG;
		}

		if ( isset( $wp_local_package ) ) {
			$locales[] = $wp_local_package;