无法从html中的sql检索最后插入的id

Question

i am trying to display some values from database to my html calling the last inserted id

$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT * from registers where id= LAST_INSERT_ID()";
$result = $conn->query($sql);

if (!empty($result) && $result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo " $row[firstname] ";
    }
} else {
    echo "0 results";
}

But when I am using this, the result is not being displayed, is there any problem with my code, how do I retrieve the last inserted id from sql?

</div>

Answer 1

try this query

$sql = "SELECT * from registers ORDER BY ID DESC limit 1 ";

it will give you only one result and this result will be the last inserted ID. But ID needs to be auto increment.