How to insert the button pressed in the database

Question

In my code I have 3 buttons, which serve for the user to classify the service:

<input type="submit" name="verde" class="verde" value="">
<input type="submit" name="amarelo" class="amarelo" value="">
<input type="submit" name="vermelho" class="vermelho" value="">

How do I put in the database, in the table, the "button" that he chose to classify the service? The data is being entered without problem, I’m just having problems in how to insert in the field classificacao.

So far I’m doing this:

if (isset($_POST['verde']) || isset($_POST['amarelo']) || isset($_POST['vermelho'])) {
    $inserir=mysqli_query($link,"INSERT INTO questionario (pergunta_id, pergunta, hora, idioma, origem, classificacao) VALUES ('','$stringarray','$hora','$lang', '','')");
    if (!$inserir) {
        echo "Erro ao inserir na tabela.";
    } else {
        header('location: comentario.php');
    }
}

Answer 1

Setting the color in value from the button instead of name:

<input type="submit" name="botao" class="verde" value="verde">
<input type="submit" name="botao" class="amarelo" value="amarelo">
<input type="submit" name="botao" class="vermelho" value="vermelho">

In the PHP just do it like that:

if (isset($_POST['botao'])) {
    $classificacao = $_POST['botao'];
    $inserir=mysqli_query($link,"INSERT INTO questionario (pergunta_id, pergunta, hora, idioma, origem, classificacao) VALUES ('','$stringarray','$hora','$lang', '','$classificacao')");
    //restante do código

Edit with the check, without having to fill the value button:

if (isset($_POST['verde'])){
    $classificacao = $_POST['verde'];
}elseif(isset($_POST['amarelo'])){
    $classificacao = $_POST['amarelo'];
}elseif(isset($_POST['vermelho'])){
    $classificacao = $_POST['vermelho'];
}
if(isset($classificacao)){
    $inserir=mysqli_query($link,"INSERT INTO questionario (pergunta_id, pergunta, hora, idioma, origem, classificacao) VALUES ('','$stringarray','$hora','$lang', '','$classificacao')");
    //restante do código