从查询中设置变量的值

Question

嗨，任何人都知道如何获得TID 。 我只需要TID并将其设置为变量$TID

$sql = 'SELECT TID FROM  walkin ORDER BY TID DESC LIMIT 1';

$result = mysqli_query($conn, $sql);

if ($conn->error) {
    die("Query failed: " . $conn->error);
}
$TID = /answer here/

Answer 1

带有bind_result和fetch调用的准备好的语句怎么样？

if($stmt=$conn->prepare("SELECT TID FROM walkin ORDER BY TID DESC LIMIT 1")){
    if($stmt->execute() && $stmt->bind_result($TID) && $stmt->fetch()){
        echo $TID;
    }
}