bootstrap 5 form with php sending

I need an Bootstrap 5 Form. Also i need the php code for that for sending this form. On our new Website we use bootstrap 5. I only need the form from begining <section> to </section>

We dont want recapta. We need a security system like caluclate 7¨+10 or so, because we dont want to have google or some in our website code. (new law).

Please see in shedule the screenshots of the form.