php - 获取特定列并比较值 php

Question

您好，我想比较两列中的两个值，但它无法正常工作。我需要转换结果吗？我做错了什么？

$query = "SELECT `columm1`, `columm2` FROM `table` WHERE `id` = ? ";
$stmt = $conn->prepare($query);
$stmt->bindParam(1,$eventID);
$stmt->execute();
$currentJoin = (int)  $stmt->fetchColumn();
$maxParticipants = (int) $stmt->fetchColumn(1);

if($currentJoin >= $maxParticipants){
    return;
}
else{

Answer 1

Warning There is no way to return another column from the same row if you use PDOStatement::fetchColumn() to retrieve data. - fetchColumn()

您可以使用fetch()相反

$stmt->execute();
$result = $stmt->fetch();
if($result[0] >= $result[1] ){
    // ...
}