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_WP_Editors::get_mce_locale() public WP 4.8.0

Returns the TinyMCE locale.

{} It's a method of the class: _WP_Editors{}

This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.

No Hooks.

Return

String. Null. Nothing.

Usage

$result = _WP_Editors::get_mce_locale();

Changelog

Since 4.8.0 Introduced.

Code of _WP_Editors::get_mce_locale() WP 5.7

wp-includes/class-wp-editor.php 
<?php
public static function get_mce_locale() {
	if ( empty( self::$mce_locale ) ) {
		$mce_locale       = get_user_locale();
		self::$mce_locale = empty( $mce_locale ) ? 'en' : strtolower( substr( $mce_locale, 0, 2 ) ); // ISO 639-1.
	}

	return self::$mce_locale;
}