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			_load_textdomain_just_in_time is private and should not be used in themes or plugins directly.
_load_textdomain_just_in_time › WordPress Function
Since4.6.0
Deprecatedn/a
› _load_textdomain_just_in_time ( $domain )
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| Parameters: | 
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| Returns: | 
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| Defined at: | 
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| Codex: | 
Loads plugin and theme text domains just-in-time.
When a textdomain is encountered for the first time, we try to load the translation file fromwp-content/languages, removing the need
to call load_plugin_textdomain() or load_theme_textdomain().Related Functions: load_textdomain, unload_textdomain, load_theme_textdomain, load_plugin_textdomain, load_script_textdomain
	Source
function _load_textdomain_just_in_time( $domain ) {
	/** @var WP_Textdomain_Registry $wp_textdomain_registry */
	global $l10n_unloaded, $wp_textdomain_registry;
	$l10n_unloaded = (array) $l10n_unloaded;
	// Short-circuit if domain is 'default' which is reserved for core.
	if ( 'default' === $domain || isset( $l10n_unloaded[ $domain ] ) ) {
		return false;
	}
	if ( ! $wp_textdomain_registry->has( $domain ) ) {
		return false;
	}
	$locale = determine_locale();
	$path   = $wp_textdomain_registry->get( $domain, $locale );
	if ( ! $path ) {
		return false;
	}
	if ( ! doing_action( 'after_setup_theme' ) && ! did_action( 'after_setup_theme' ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			sprintf(
				/* translators: 1: The text domain. 2: 'init'. */
				__( 'Translation loading for the %1$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.' ),
				'<code>' . $domain . '</code>',
				'<code>init</code>'
			),
			'6.7.0'
		);
	}
	// Themes with their language directory outside of WP_LANG_DIR have a different file name.
	$template_directory   = trailingslashit( get_template_directory() );
	$stylesheet_directory = trailingslashit( get_stylesheet_directory() );
	if ( str_starts_with( $path, $template_directory ) || str_starts_with( $path, $stylesheet_directory ) ) {
		$mofile = "{$path}{$locale}.mo";
	} else {
		$mofile = "{$path}{$domain}-{$locale}.mo";
	}
	return load_textdomain( $domain, $mofile, $locale );
}