调用资源上的成员函数fetch_object（）

Question

I have written this PHP file which contains SQL to gather all posts in a table.

$selectpost = mysql_query("
SELECT 
posts.id,
COUNT(post_likes.id) AS likes

FROM posts

LEFT JOIN post_likes
ON posts.id = post_likes.post

GROUP BY posts.id

");

while($row = $selectpost->fetch_object()) {

$posts[] = $row;    
}

for some reason i keep getting this error:

Call to a member function fetch_object() on resource in posts.php on line 23

line 23 is the while loop:

while($row = $selectpost->fetch_object()) {

connecting to database like this:

$db = mysql_connect('localhost', 'account', 'password');

$dbs = mysql_select_db('site');

what is wrong, i cant fix it..

Answer 1

$selectpost->fetch_object() is a mysqli fucntion so $selectpost needs to be a mysqli result.

for mysql_query() uses the non object oriented mysql_fetch_object( )

basically you mysql_query() hasn't returned a mysqli object but your trying to make mysqli methos calls on it.

http://php.net/manual/en/function.mysql-fetch-object.php

Answer 2

You are using the mysql_ PHP extension so you would have to use

while($row = mysql_fetch_object($selectpost)) {

Of course you should really not be using the mysql_ extension as it is deprecated