_load_textdomain_just_in_time( string $domain ): bool

1359function _load_textdomain_just_in_time( $domain ) {1360	/** @var WP_Textdomain_Registry $wp_textdomain_registry */1361	global $l10n_unloaded, $wp_textdomain_registry;1362 1363	$l10n_unloaded = (array) $l10n_unloaded;1364 1365	// Short-circuit if domain is 'default' which is reserved for core.1366	if ( 'default' === $domain || isset( $l10n_unloaded[ $domain ] ) ) {1367		return false;1368	}1369 1370	if ( ! $wp_textdomain_registry->has( $domain ) ) {1371		return false;1372	}1373 1374	$locale = determine_locale();1375	$path   = $wp_textdomain_registry->get( $domain, $locale );1376	if ( ! $path ) {1377		return false;1378	}1379 1380	if ( ! doing_action( 'after_setup_theme' ) && ! did_action( 'after_setup_theme' ) ) {1381		_doing_it_wrong(1382			__FUNCTION__,1383			sprintf(1384				/* translators: 1: The text domain. 2: 'init'. */1385				__( 'Translation loading for the %1$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.' ),1386				'<code>' . $domain . '</code>',1387				'<code>init</code>'1388			),1389			'6.7.0'1390		);1391	}1392 1393	// Themes with their language directory outside of WP_LANG_DIR have a different file name.1394	$template_directory   = trailingslashit( get_template_directory() );1395	$stylesheet_directory = trailingslashit( get_stylesheet_directory() );1396	if ( str_starts_with( $path, $template_directory ) || str_starts_with( $path, $stylesheet_directory ) ) {1397		$mofile = "{$path}{$locale}.mo";1398	} else {1399		$mofile = "{$path}{$domain}-{$locale}.mo";1400	}1401 1402	return load_textdomain( $domain, $mofile, $locale );1403}