从stdClass对象中删除stdClass对象和count（post_id）（[count（post_id）] =＆gt; 1）只需要结果1

Question

我的mysql查询是：

$query=('SELECT count(post_id)  FROM comments where   post_id='.$row['post_id']);
 $usercomments = $this->db->query($query);
 foreach ($usercomments->result() as $comments)

我得到的输出：

stdClass Object ( [count(post_id)] => 1 )

如何获得计数值1？怎么打印？

Answer 1

将您的查询更改为：

SELECT count(post_id)  FROM comments where   post_id='.$row['post_id'];

到

SELECT count(post_id) as post_count  FROM comments where   post_id='.$row['post_id'];
//here post_count is an ALIAS for the count(post_id)

然后得到它的值：

$comments->post_count;

Answer 2

你可以这样做：

$comments = (array)$comments;
$count = reset($comments);

var_dump($count); // => 1

注意：reset返回数组的第一个值。

Answer 3

您可以使用获取字符串来获取包含PHP字符的值：

$usercomments->{"count(post_id)"};

Answer 4

您可以使用别名

$query=('SELECT count(post_id) as numberPost  FROM comments where   post_id='.$row['post_id']);
$usercomments = $this->db->query($query);
 foreach ($usercomments->result() as $comments)

所以你可以像这样访问对象

comments->numberPost