S

function doSomeQueries()
{
    if($stmt = $mysqli->prepare("INSERT INTO table VALUES (?, ?, ?);"))
    {
        $stmt->bind_param("sss", $a, $b, $c);

            if(!$stmt->execute())
            {
                sendMail("mysqliError");
            }

            $stmt->close();
    }
    else
    {
            sendMail("mysqliError");
    }




    if($stmt = $mysqli->prepare("INSERT INTO table VALUES (?);"))
    {
        $stmt->bind_param("s", $a);

            if(!$stmt->execute())
            {
                sendMail("mysqliError");
            }

            $stmt->close();
    }
    else
    {
            sendMail("mysqliError");
    }
}