Use a value/name on the button.

View

    <form action="/url" method="post">
    <input name="some_field" value="1">

    <button type="submit" name="form1">Submit 2</button>
    </form>

<form action="/url" method="post">
    <input name="some_field" value="1">

    <button type="submit" name="form2">Submit 2</button>
</form>


Controller

    if ($request->has('form1') {
    return 'form1 was submitted';
}

if ($request->has('form2') {
    return 'form2 was submitted';
}