Re: Notice: Object of class mysqli could not be converted to int in C:\wamp64\www\

[Barry Galbraith]

Your form is POSTing variables named

name
email
phone
cell
address
subject
message

Then salvatest.php is trying to read variables named

$_POST['nome']
$_POST['email']
$_POST['telefone']
$_POST['celular']
$_POST['endereco']
$_POST['assunto']
$_POST['mensagem']

See something wrong here? Only one of your variables has a chance of being there, $_POST['email']
You have to use the variables you send. They don't magically change names.

Also, salvatest.php is trying to

include_once("conexao.php")

and your connection file is called connect.php

So, either rename your connect.php to conexao.php, or include connect.php

Good luck,
Barry.