This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

wp_set_lang_dir()

Set the location of the language directory.

Description

To set directory manually, define the WP_LANG_DIR constant in wp-config.php.

If the language directory exists within WP_CONTENT_DIR, it is used. Otherwise the language directory is assumed to live in WPINC.

Source

File: wp-includes/load.php

function wp_set_lang_dir() {
	if ( !defined( 'WP_LANG_DIR' ) ) {
		if ( file_exists( WP_CONTENT_DIR . '/languages' ) && @is_dir( WP_CONTENT_DIR . '/languages' ) || !@is_dir(ABSPATH . WPINC . '/languages') ) {
			/**
			 * Server path of the language directory.
			 *
			 * No leading slash, no trailing slash, full path, not relative to ABSPATH
			 *
			 * @since WP-2.1.0
			 */
			define( 'WP_LANG_DIR', WP_CONTENT_DIR . '/languages' );
			if ( !defined( 'LANGDIR' ) ) {
				// Old static relative path maintained for limited backward compatibility - won't work in some cases.
				define( 'LANGDIR', 'wp-content/languages' );
			}
		} else {
			/**
			 * Server path of the language directory.
			 *
			 * No leading slash, no trailing slash, full path, not relative to `ABSPATH`.
			 *
			 * @since WP-2.1.0
			 */
			define( 'WP_LANG_DIR', ABSPATH . WPINC . '/languages' );
			if ( !defined( 'LANGDIR' ) ) {
				// Old relative path maintained for backward compatibility.
				define( 'LANGDIR', WPINC . '/languages' );
			}
		}
	}
}

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Changelog

Changelog
Version	Description
WP-3.0.0	Introduced.