Reply To: Prefilling fields not visible to user

• John Huebner

• August 21, 2020 at 1:28 am

You need to put add_filter() outside of the function

function my_acf_prepare_field( $field ) {

    // Lock-in the value "https://instagram.com/".
    if( $field['value'] === 'https://instagram.com/' ) {
        $field['readonly'] = true;
    };
    return $field;
}
add_filter('acf/prepare_field/name=instagram', 'my_acf_prepare_field');