_load_textdomain_just_in_time( string $domain ): bool

1423function _load_textdomain_just_in_time( $domain ) {1424	/** @var WP_Textdomain_Registry $wp_textdomain_registry */1425	global $l10n_unloaded, $wp_textdomain_registry;1426 1427	$l10n_unloaded = (array) $l10n_unloaded;1428 1429	// Short-circuit if domain is 'default' which is reserved for core.1430	if ( 'default' === $domain || isset( $l10n_unloaded[ $domain ] ) ) {1431		return false;1432	}1433 1434	if ( ! $wp_textdomain_registry->has( $domain ) ) {1435		return false;1436	}1437 1438	$locale = determine_locale();1439	$path   = $wp_textdomain_registry->get( $domain, $locale );1440	if ( ! $path ) {1441		return false;1442	}1443 1444	if ( ! doing_action( 'after_setup_theme' ) && ! did_action( 'after_setup_theme' ) ) {1445		_doing_it_wrong(1446			__FUNCTION__,1447			sprintf(1448				/* translators: 1: The text domain. 2: 'init'. */1449				__( 'Translation loading for the %1$s domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the %2$s action or later.' ),1450				'<code>' . $domain . '</code>',1451				'<code>init</code>'1452			),1453			'6.7.0'1454		);1455	}1456 1457	// Themes with their language directory outside of WP_LANG_DIR have a different file name.1458	$template_directory   = trailingslashit( get_template_directory() );1459	$stylesheet_directory = trailingslashit( get_stylesheet_directory() );1460	if ( str_starts_with( $path, $template_directory ) || str_starts_with( $path, $stylesheet_directory ) ) {1461		$mofile = "{$path}{$locale}.mo";1462	} else {1463		$mofile = "{$path}{$domain}-{$locale}.mo";1464	}1465 1466	return load_textdomain( $domain, $mofile, $locale );1467}