Registration is not updated in the database

Question

I have an application that takes the content of a given site and compares if it is different from the current one comparing to the record in the database and sends an email that had a change, in addition to updating in the database with the new content to be used in the next check.

It was working properly the feature, but now stopped for good.

But it was not the first time that this problem occurred, I had to put a ibase_commit to update correctly in the bank. And it has to do with the method below, since I passed a String to test directly in the method call and the record was not updated and the method is always called since I put a echo 'ok' and returned at CMD.

Follow the Controller function:

    public function update($codigo, $conteudo){

        $connect = OpenConnection();    

        $query = ibase_query($connect, "UPDATE CAD_SITES SET CONTEUDO = ?, DATA_ENVIO_EMAIL = ?, HORA_ENVIO_EMAIL = ? WHERE CODIGO = ?", 'Teste', date('d-m-Y'), date('G:i:s'), $codigo);
        $result = false;

        if ($query){
            $result = ibase_commit($connect);
            if($result){
              echo "Alterou";
            } else {
              echo "Não alterou";  
            }
        }

        if (ibase_errmsg()){
            $result = '[ERRO] '.ibase_errmsg();
        }

        return $result;         

    }