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load_theme_textdomain( string $domain, string $path = false )

Load the theme’s translated strings.

Description

If the current locale exists as a .mo file in the theme’s root directory, it will be included in the translated strings by the $domain.

The .mo files must be named based on the locale exactly.

Parameters

$domain

(string) (Required) Text domain. Unique identifier for retrieving translated strings.

$path

(string) (Optional) Path to the directory containing the .mo file.

Default value: false

Return

(bool) True when textdomain is successfully loaded, false otherwise.

Source

File: wp-includes/l10n.php

function load_theme_textdomain( $domain, $path = false ) {
	/**
	 * Filters a theme's locale.
	 *
	 * @since 3.0.0
	 *
	 * @param string $locale The theme's current locale.
	 * @param string $domain Text domain. Unique identifier for retrieving translated strings.
	 */
	$locale = apply_filters( 'theme_locale', determine_locale(), $domain );

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

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

	if ( ! $path ) {
		$path = get_template_directory();
	}

	return load_textdomain( $domain, $path . '/' . $locale . '.mo' );
}

Changelog

Version Description
4.6.0 The function now tries to load the .mo file from the languages directory first.
1.5.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/load_theme_textdomain