PDO / PHP查询不返回数组的结果

Question

我有下面的代码似乎没问题，只是它不会回应结果。如果我将echo语句更改为只读取echo $ pointrow，那么它将返回＆＃34; array＆＃34;。所以我按照下面的方式编写了它，现在页面上根本没有任何内容。不确定我做错了什么。点表中确实有一个名为points的列。

<?php
$pointresults = $dbh->prepare("SELECT
wp_users.ID,
points.points
FROM wp_users
LEFT JOIN points on points.ID = wp_users.ID
WHERE (wp_users.ID = $user_ID)");

$pointresults->bindParam(':wp_users.ID', $user_ID, PDO::PARAM_INT); 
$pointresults->bindParam(':points.ID', $ID, PDO::PARAM_INT); 
$pointresults->execute();
$pointrow = $pointresults->fetchAll(PDO::FETCH_ASSOC);
?>

<?php echo $pointrow[0]['points'] ?>

Answer 1

请试试这个：

<?php
$pointresults = $dbh->prepare("SELECT
wp_users.ID,
points.points
FROM wp_users
LEFT JOIN points on points.ID = wp_users.ID
WHERE (wp_users.ID = :user_ID)");

$pointresults->bindParam(':user_ID', $user_ID, PDO::PARAM_INT); 
$pointresults->execute();
$pointrow = $pointresults->fetchAll();
?>

<?php echo $pointrow[0]['points'] ?>