JanrikV

You can add add_filter in wp-config.php, but it is not recommended.

Can you make changes to functions.php? If so, you can try this.

add_filter( 'auto_core_update_send_email', '__return_false' );

• This reply was modified 6 years, 2 months ago by JanrikV.

Have you tried quotes? E.g.

$secret = "RECAPTCHA_KEY";

• This reply was modified 6 years, 3 months ago by JanrikV. Reason: Quotes added