PDO/PHP查询不返回数组的结果

Question

我有下面的代码，似乎很好，但它不会回显结果。如果我将echo语句更改为只读echo $ pointrow，那么它将返回“array”。所以我按照以下的方式编写它，现在页面上什么都没有。不知道我做错了什么。点表中确实有一列称为点。

<?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'] ?>