wp-includes/l10n.php:1041Loads the translated strings for a plugin residing in the mu-plugins directory.
$domainstring$mu_plugin_rel_pathstringoptional''boolfunction load_muplugin_textdomain( $domain, $mu_plugin_rel_path = '' ) { /** @var WP_Textdomain_Registry $wp_textdomain_registry */ /** @var array<string, WP_Translations|NOOP_Translations> $l10n */ global $wp_textdomain_registry, $l10n; if ( ! is_string( $domain ) ) { return false; } $path = WPMU_PLUGIN_DIR . '/' . ltrim( $mu_plugin_rel_path, '/' ); $wp_textdomain_registry->set_custom_path( $domain, $path ); // If just-in-time loading was triggered before, reset the entry so it can be tried again. if ( isset( $l10n[ $domain ] ) && $l10n[ $domain ] instanceof NOOP_Translations ) { unset( $l10n[ $domain ] ); } return true;}Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/l10n.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.