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load_muplugin_textdomain() WP 1.0

Load the translated strings for a plugin residing in the mu-plugins directory.

Works based on: load_textdomain()
Hooks from the function

true|false. True when textdomain is successfully loaded, false otherwise.


load_muplugin_textdomain( $domain, $mu_plugin_rel_path );
$domain(string) (required)
Text domain. Unique identifier for retrieving translated strings.
Relative to WPMU_PLUGIN_DIR directory in which the .mo file resides.
Default: empty string


Since 3.0.0 Introduced.
Since 4.6.0 The function now tries to load the .mo file from the languages directory first.

Code of load_muplugin_textdomain() WP 5.7.1

function load_muplugin_textdomain( $domain, $mu_plugin_rel_path = '' ) {
	/** This filter is documented in wp-includes/l10n.php */
	$locale = apply_filters( 'plugin_locale', determine_locale(), $domain );

	$mofile = $domain . '-' . $locale . '.mo';

	// Try to load from the languages directory first.
	if ( load_textdomain( $domain, WP_LANG_DIR . '/plugins/' . $mofile ) ) {
		return true;

	$path = WPMU_PLUGIN_DIR . '/' . ltrim( $mu_plugin_rel_path, '/' );

	return load_textdomain( $domain, $path . '/' . $mofile );

From tag: textdomain (mo po files)

More from tag: localize (l10n i18n Internationalization localization)

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