Use PDO with PHP

Good morning, I created a function to get the ids of all the processes of a table, as shown in the code below

    function getProcessos()
{
   $conecta = new PDO('mysql:host=localhost; dbname=processos','root','root');
    $sql = "SELECT id from processo where opcao='S' limit 10";
    $resultado = $conecta->prepare($sql);
    $resultado->execute();
    $dados = $resultado->fetchAll(PDO::FETCH_OBJ);
       return $dados;
}

Now I need to filter in the processes table by the processes obtained in the above function

$processo = getProcessos();
     // var_dump($processo);

     foreach ($processo as $linhas) {
         $linha = $linhas->id;
         $sql = "select * from andamento where idprocesso=$linha limit 10";
         $stmt = $conecta->prepare($sql);
         var_dump($stmt);
         $stmt->execute();
         $dados = $stmt->fetchAll();
         // var_dump($dados);
}

When I give var_dump to $ stmt it returns public 'queryString' = > string 'select * from progress where idprocesso = 5873, where it always modifies idprocesses according to the function getProcesso (); But when I give var_dump ($ data) it returns 10 empty arrays