PHP PDO从行索引返回列值

Question

我写了这段代码：

$statement = $db->prepare("SELECT answer FROM question WHERE question = :question");
$statement->execute(array(':question' => $question));
$row = $statement->fetch();
$answer = $row['answer']; // this gives me a number

现在我想从列中检索该行的值（给定的数字）+1

我该怎么做才能得到它？

Answer 1

选择所有字段（SELECT * FROM...）并使用$row[$answer + 1]：

$statement = $db->prepare("SELECT * FROM question WHERE question = :question");
$statement->execute(array(':question' => $question));
$row = $statement->fetch();
$answer = $row['answer'];
$other = $row[$answer + 1];