WordPress: remove the password change notification email

remove-pass-change-email.php

<?pgp
add_action( 'wp_head', 'remove_notificationpassword_emails',100 );
function remove_notificationpassword_emails() {
  remove_action( 'after_password_reset', 'wp_password_change_notification', 11 );
  add_filter( 'send_password_change_email', '__return_false' );
}

add_filter( 'send_password_change_email', '__return_false' );


if ( ! function_exists( 'wp_password_change_notification' ) ) {
  function wp_password_change_notification( $user ) {
    return;
  }
}
// some of the above are redundant but not sure which one.