wp-includes/class-wp-locale-switcher.php:61Initializes the locale switcher.
public function init() { add_filter( 'locale', array( $this, 'filter_locale' ) ); add_filter( 'determine_locale', array( $this, 'filter_locale' ) ); }Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-locale-switcher.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.