Send dynamic ids in POST to another php file

Hello, I am creating some dynamic inputs in the following way:

$(".reporteBody").append('<input type="text" name="titulo' + y + '" id="tiulo' + y + '" value="Caja # ' + y + '">');

Let's say that 3 inputs are created, and since they are inside a form, by means of a button I am passing them to another php file by POST and I receive it like this:

for($i=0;$i<3;$i++){
    $titulo.$i.=$_POST['titulo'.$i];
}

But I get an error when I visualize the file not in the editor, what is the correct way to pass these dynamic values (regardless of the number) and display them correctly?

Thank you.